Drawings and general provisions of the contract, including General and Supplementary Conditions, Section 23 0500 and other Division I specification Sections




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SECTION 23 4145 - HEPA CONTAINMENT FILTER ASSEMBLIES

PART 1 - GENERAL

    1. RELATED DOCUMENTS

      1. Drawings and general provisions of the contract, including General and Supplementary Conditions, Section 23 0500 and other Division I Specification Sections, apply to this Section.

    2. WORK INCLUDED

      1. Containment filter housings

      2. Prefilters

      3. High Efficiency Particulate Air (HEPA) filters

      4. Isolation dampers

      5. Differential pressure filter gages

    3. RELATED SECTIONS

      1. Examine all drawings and criteria sheets and all other Sections of the Specifications for requirements, which affect work under this Section whether or not such work is specifically mentioned in this Section.

      2. Refer to Section 23 4100 for HEPA filters to be furnished by the containment manufacturer.

    4. REFERENCES

      1. Applicable provisions of the following Codes and Trade Standard Publications shall apply to the work under this Section whether or not such work is specifically mentioned in this section.

      2. Applicable provisions of the following Codes and Trade Standard Publications shall apply to the work under this Section whether or not such work is specifically mentioned in this section.

        1. ASHRAE – American Society of Heating, Refrigeration and Air-Conditioning Engineers

          1. ASHRAE 52.2: Method of Testing Air-Cleaning Devices in General Ventilation for Removal Efficiency by Particulate Size (Minimum Efficiency Reporting Value)

        2. ASME – American Society of Mechanical Engineers

          1. AG-1-2003: Code on Nuclear Air and Gas Treatment

          2. NQA-1-2008: Quality Assurance Requirements for Nuclear Facility Applications (QA)

          3. N509-2002: Nuclear Power Plant Air Cleaning Units and Components

          4. N510-2007: Testing of Nuclear Air Cleaning Systems

          5. N511-2007: In-Service Testing of Nuclear Air Treatment, Heating, Ventilating, and Air-Conditioning Systems

          6. BPVC-IX-2007: Welding and Brazing Qualifications

        3. ASNT – American Society of Nondestructive Testing

          1. SNT-TC-1A (2006): Recommended Practice No. SNT-TC-1A: Personnel Qualification and Certification in Nondestructive Testing

        4. AWS – American Welding Society

          1. D9.1M/D9.1:2006: Sheet Metal Welding Code

        5. DOE – US Department of Energy

          1. HDBK-1169-2003: Nuclear Air Cleaning Handbook

        6. IEST – Institute of Environmental Sciences and Technologies

          1. IEST-RP-CC001.4: HEPA and ULPA Filters

          2. IEST-RP-CC002.2: Unidirectional Flow Clean-Air Devices

          3. IEST-RP-CC008.2: Gas-Phase Adsorber Cells

          4. IEST-RP-CC034.2: HEPA And ULPA Filter Leak Tests

        7. UL – Underwriter’s Laboratory

          1. UL 900: Air Filter Units

    5. QUALITY ASSURANCE

      1. Filter media shall be UL 900 listed, Class 1 or Class 2 as specified.

      2. A written quality assurance program must be established for all components of the containment filtration system and the manufacture shall meet and conform to all of the sections of the ASME NQA-1 quality assurance program.

      3. Assemble filters and housing components to form a containment filtration system from a single manufacture (excepting vended components such as differential pressure gages and valves).

    6. SUBMITTALS

      1. See Section 23 0500 and General Conditions for additional requirements.

      2. Submit product data:

        1. Bid Documents: In order to validate the Filter Housing Offer fully meets the drawings and specification, the Housing Manufacturer shall furnish the following qualifying documentation with their Bid.

          1. Statement of complete scope of supply.

          2. Statement that clearly states how the scope of supply meets the specification and a listing of all non-compliant features.

          3. Supporting documentation to demonstrate specification compliance.

          4. Submit appropriate catalog cut sheets related to the bid offer.

          5. Submit validation reports for the following:

            1. R&D report validating the offered upstream test challenge injection section operates within the specified parameters

            2. Validating the automated function of the scan section.

            3. Validating the ability of the in-situ scanning section to locate and size leaks in both high-capacity and V-Bed HEPA filters

        2. Engineering Submittal Documents: The selected Offeror shall furnish the following documentation for Engineer Approval and Fabrication Release.

          1. Submit a copy of the project specification stating line by line compliance.

          2. Submit General Arrangement drawings for each Filter Housing size and configuration. As a minimum, the following shall be included.

          3. Overall dimensions

          4. Interface locations and sizes

          5. Mounting base anchor bolt plan

          6. Service clearance dimensions

          7. Filter and differential pressure gage requirements for each housing tag number

          8. Submit an uncontrolled copy of the manufacturer’s Quality Assurance manual

        3. Delivery Documentation: The Filter Box manufacturer shall furnish the following documentation in conjunction with their equipment delivery.

          1. Submit Housing Leak test reports

          2. Submit Seal Surface Leak test reports

          3. Submit Filter fit report

          4. Submit final as-built drawings

          5. Submit three (3) copies of Operations and Maintenance manuals

    7. EXTRA STOCK

      1. Provide one extra set of all required prefilters and HEPA filters,

      2. Provide two extra sets of all required PVC change-out bags and straps.

    8. DELIVERY, STORAGE, and HANDLING

      1. Housings shall be shipped to the jobsite on factory fabricated protective skids or containers (if size allows). Items shall be blocked, anchored, braced and/or cushioned as deemed necessary to prevent physical damage. All openings shall be covered. The housings and filters shall be stored in a clean dry place and protected from weather and construction traffic. Housings shall be handled carefully to avoid contact with carbon steel and damage to accessory components, enclosures and finish.

PART 2 - PRODUCTS

    1. ACCEPTABLE MANUFACTURERS CONTINGENT OF COMPLIANCE WITH SPECIFICATONS

      1. Camfil Farr (Basis of Design)

      2. Substitutions

        1. Due to life safety concerns, this specification section describes highly specialized equipment and components that are known to be included in the basis of design. Equipment and component substitutions may be made at the time of bid. However, a full evaluation package shall be included with the alternate manufacture’s proposal. The offeror shall clearly state the proposed manufacturer’s offers of all equipment and components specified under this section. The offeror shall provide a complete and detailed response to each paragraph of the contract specification. The offeror shall clearly note after each specification paragraph one of the following responses: 1. comply, 2. deviate, or 3. exception. For deviation or exception responses, the offeror shall fully explain the deviation or exception. Detailed equipment drawings shall be furnished to demonstrate full compliance with the dimensional requirements shown on the contract drawings. Any deviation shall be clearly shown on the drawings of the proposed equipment. Any alternative bids not including the above required information will be rejected. The Contractor shall bear to the responsibility to furnish equipment in complete compliance with this specification. The owner or its representative reserves the right to reject any deviation or exception if it does not meet the intent or the requirements of this project.

        2. All acceptable manufacturers shall be the producer of all of the products specified in this Section. Vended products shall be limited to raw materials, fasteners, gages, damper operators and valves. The specified filters shall be produced by the same company that produces the filter housings. The offeror shall clearly identify all purchased components, weldments and assemblies from outside sources. Failure to comply shall result in the rejection of the offered product.

    2. BAG-IN/BAG-OUT CONTAINMENT FILTER HOUSINGS

      1. General

        1. The Bag-in / Bag-out Containment Filtration system shall be Camfil Farr CamContain fully integrated packaged units, that have been fabricated, assembled and pressure decay tested in the same factory. Each system shall consist of the following housing sections and components assembled into an integrated containment system:

          1. flanged inlet transition

          2. inlet isolation damper

          3. in-place test injection section with decontamination valve assembly

          4. Prefilter section

          5. HEPA filter section

          6. HEPA filter automated in-place scanning section with decontamination valve assembly

          7. outlet isolation damper

          8. outlet transition

          9. assembly welded on to a mounting structure

        2. The system shall be designed for the scheduled CFM as indicated on the contract documents at 10 inches water gage and the maximum design temperature shall be 130°F. The furnished system shall be sized not to exceed the scheduled “clean” pressure drop across the containment system from inlet flange to outlet flange, including the inlet and outlet bubble-tight dampers. The scheduled “dirty” pressure drop assumes the “clean” HEPA filter initial pressure drop times two.

        3. Access Doors

          1. There shall be four (4) tie down latches per access door and they shall be manufactured in such a manner that they pivot away from the bag-out port after they are released, therefore, the latches do not impede the filter change-out process. The latch shall be designed to provide both a retainer for the aluminum star knob and to eliminate the hazard of a sharp protruding object.

        4. Transitions

          1. Each containment system shall be fitted with reducing transitions.

          2. Transitions shall be constructed of unpainted 304L stainless steel and designed with reinforcement to withstand a negative or positive working pressure of 10” water gauge. The minimum acceptable sheet metal thickness shall be 16 gauge. They shall be attached to the filter system by continuous seal welding. The adjoining connection to the transition shall be a 1 ½” inch wide 7 gauge plate flange.

        5. Change-out Bags

          1. One (1) PVC change-out bag shall be furnished for each access port. Each bag shall have its stock number rolled in the hem. The PVC bag material shall be 8 mil thick, yellow in color, with a translucent, taffeta textured finish and shall not stick together.

          2. For visibility during filter change-out, this bag shall include approximately 16 inches of clear PVC at the mouth. Three (3) glove sleeves shall be built into the bag to facilitate handling the filter during change-out.

          3. All PVC bags of this design shall be produced by filter housing manufacturer and shall have been tested by an independent laboratory to prove the bag's operability at extreme temperature ranges of 0°F - 130°F (a test report verifying this test shall be furnished upon request). A 3/16-inch diameter elastic shock cord shall be hemmed into the mouth of the bag so that it fits securely when stretched around the bagging ring. To prevent the bag from sliding off the bagging ring during the change-out operation, one (1) nylon security strap shall be provided with each filter access port. Additionally, one (1) nylon cinching strap shall be provided with each access port to tie off the slack in the PVC bag while the ventilation system is operating.

        6. Orientation and Handedness

          1. The contract drawings shall determine the filter access side of each housing. The handedness of a housing shall be designated as right hand or left hand. When looking in the direct of airflow (i.e. as if standing inside of the housing with the air flow hitting the person’s back) of the HEPA filter, if access is required on the right side, then the housing shall be determined to be right hand access. If access is required on the left side from the above stated vantage, then the housing shall be determined to be left hand access.

        7. All pressure retaining weld joints and seams shall be continuously welded with no pores allowed. Joints and seams requiring only intermittent welds, such as reinforcement members, shall not be continuously welded. As a minimum, joints and seams shall be wire brushed and/or buffed to remove heat discoloration, burrs and sharp edges. All weld joints and seams that are a portion of any gasket-sealing surface (e.g., duct connecting flanges) shall be ground smooth and flush with the adjacent base metal.

        8. The upstream and downstream flanges shall have a 1 ½ inch minimum flange width. Flanges shall be turned to the outside of the airstream to prevent contamination build-up and allow the customer to connect mating ductwork from outside the housing.

        9. All hardware on the HEPA filter housing and all mechanical components shall be 300 series stainless steel, except for the nylon washers, tubing, and the cast aluminum doorknobs.

        10. All welding procedures, welders and welder operators shall be qualified in accordance with ASME BPVC-IX-2007: Welding and Brazing Qualifications. All production welds shall be visually inspected per AWS D9.1M/D9.1:2006: Sheet Metal Welding Code and incorporates the workmanship acceptance criteria described in sections 5 and 6.

        11. The filter housing shall be manufactured under a quality assurance program that meets all the basic requirements of ASME NQA-1, “Quality Assurance Program Requirements for Nuclear Facilities”. The manufacture shall submit documented evidence they have been independently audited by customers at least three (3) times within the last six (6) years to ASME NQA-1 requirements, and successfully passed all three (3) audits. The final containment filtration system shall be completely fabricated, assembled, tested and cleaned at the manufacturer’s facility. Sub-assemblies from outside sources will not be acceptable. The Offeror shall certify their compliance with this paragraph.

        12. The filter housing shall be tested for filter fit, operation of the filter clamping mechanism, and knife edge alignment and leak tightness before leaving the factory. Both the filter sealing surface and the complete assembly pressure boundary shall be leak tested by the “Pressure Decay Method”, in accordance with N510-2007 - Testing of Nuclear Air Cleaning Systems, paragraphs 6 and 7. Pressure readings are recorded once a minute until pressure decays to 75% of the test pressure or for 5 minutes, which ever comes first. There shall be a maximum leak rate of 0.0005 CFM per cubic foot of housing volume at 10 inches water gage.

      2. Linear Isolation Damper

        1. Damper shall be Camfil Farr Linear Isolation Damper. The damper shall be manufactured from 7 gauge, 14 gauge and 16 gauge type 304/304L stainless steel. The damper shall have a spun stainless steel dish with a receptacle that contains a closed cell silicone sponge gasket. A mating knife-edge shall be installed on the damper so that when the damper is actuated, the knife-edge will seal against the gasket.

        2. Damper shall be high-cycle, low torque linear type design. The damper mechanism shall operate linearly, without rotation or pivoting of the damper dish. The required input torque to operate and adequately seal the damper shall not exceed 25 pound-feet.

        3. The linear damper design shall be manufactured in accordance with ASME NQA-1 and ISO9001:2000 and qualified by cycle testing the assembly a minimum of 15,000 cycles. A qualified design shall pass the above specified leak test requirements without any adjustments to the assembly (including the gasket) throughout the cycle testing. Evidence of a successfully qualified design shall be furnished prior to bidding.

        4. Manually Operated Isolation Damper Operators

          1. Damper shall be factory equipped with a manual actuator. Actuator shall be equipped with a hand wheel. Actuator shall be a quarter-turn manual worm geared operator. Actuator housings and covers shall be cast iron, worms shall be heat-treated carbon steel, worm wheels shall be cast ductile iron, input shafts shall be carbon steel, shaft and worm seals shall be BUNA-N rubber, housing to cover seals shall be impregnated cellulose fiber, bushings shall be oil impregnated copper nickel steel alloy. The actuator shall be of sufficient capacity to operate the damper under all conditions, and to guarantee tight close-off of the damper against all system pressures encountered.

      3. Upstream Aerosol Mixing Section

        1. The combination of the aerosol injection ring and its position relative to the inlet isolation linear damper and the design and location of the damper and the aerosol injection ring relative to the inlet of the containment housing shall comprise an integrated system that reduces the overall unit length as compared to a conventional housing train containment system design.

        2. The aerosol injection ring located upstream of the HEPA filter shall be designed to provide uniform aerosol challenge in accordance with IEST-RP-CC034.2 for conventional box-style, high capacity HEPA filters and V-Bed HEPA filters when operating over the range of their rated flow rates to 20% of their rated flow rates. The inlet linear damper blade shall function as a distribution plate to ensure compliance with IEST-RP-CC034.2 for aerosol uniformity and/or airflow distribution per ASME N510-2007 and/or air-aerosol mixing uniformity per ASME N510-2007, Section 9. The design and location of the aerosol injection ring shall accommodate aerosol injection into the high velocity air coming through the inlet collar, and the location of the aerosol injection ring relative to the damper shall eliminate the need for distribution plates downstream of the damper.

        3. Rotating baffle plates and diffusers do not adequately represent actual operating conditions. As such, these devices are not acceptable and shall not be offered. The manufacturer shall provide detailed validation reports demonstrating compliance with IEST-RP-CC034.2 for aerosol uniformity for both conventional box-style, high capacity HEPA filters and V-Bed HEPA filters when operated at rated their flow rates and 20% of their rated flow rates.

      4. Prefilter Section

        1. The Prefilter section shall be a slide-in design. Access to the filters shall be from the side of the housing.

        2. Multi-wide HEPA sections shall be equipped with a filter removal rod to draw the filters to the change-out position. The removal rod shall be operated from inside the change-out bag and shall remove the filter by pulling against the bottom of the filter frame. There shall not be any penetrations through the housing for operation of the removal rod. All change- out operations shall be within the bag so there is a barrier between the worker and filter at all times.

        3. The Prefilter housing section shall have a bagging ring around each access port. The bagging rings shall have two (2) continuous ribs to secure the PVC filter change-out and scan bags. The outer edge of the ring shall be hemmed to prevent the PVC bag from tearing. Each access port and bagging ring shall be covered by an access door having an extruded silicone gasket that is manually replaceable (if damaged) after the door has been removed. When closed, the door shall not press against the bag-out port and PVC bag, thus eliminating the possibility of the bag being cut by pressure from the door to the bag and bag-out port.

        4. A minimum of four (4) feet clearance in front of each access door on the HEPA containment filter assembly shall be reserved for filter replacement and in-place testing.

      5. HEPA Filter Section

        1. The HEPA filter section shall be a fluid seal design, which incorporates a knife-edge that mates into the fluid filled perimeter channel on the face of the filter. Access to the filters shall be from the side of the housing. There shall be a safety feature where the filter locking handle and access door shall interface in such a manner that helps reduce the possibility of the door being closed until the filters are correctly seated in the housing. Prior to leaving the factory, each knife-edge shall be checked with an alignment gage to insure proper alignment with the filter. The filter sealing mechanisms shall be replaceable and shall be operated through the change-out bag by a locking handle. The mechanism shall exert equal force at the top and bottom edge of the filter when engaging or disengaging the filter at the knife-edge.

        2. Multi-wide HEPA sections shall be equipped with a filter removal rod to draw the filters to the change-out position. The removal rod shall be operated from inside the change-out bag and shall remove the filter by pulling against the bottom of the filter frame. There shall not be any penetrations through the housing for operation of the removal rod. All change- out operations shall be within the bag so there is a barrier between the worker and filter at all times.

        3. The HEPA filter housing section shall have a bagging ring around each access port. The bagging rings shall have two (2) continuous ribs to secure the PVC filter change-out and scan bags. The outer edge of the ring shall be hemmed to prevent the PVC bag from tearing. Each access port and bagging ring shall be covered by an access door having an extruded silicone gasket that is manually replaceable (if damaged) after the door has been removed. When closed, the door shall not press against the bag-out port and PVC bag, thus eliminating the possibility of the bag being cut by pressure from the door to the bag and bag-out port.

        4. A minimum of four (4) feet clearance in front of each access door on the HEPA containment filter assembly shall be reserved for filter replacement and in-place testing.

      6. HEPA Filter Automated Scanning Section

        1. The scan section shall be non-intrusive and shall not require the external pressure boundary of the housing to be breached in order to conduct an in-situ scan test. The in-situ scan test housing shall be designed to perform in-place scan testing of HEPA filter(s) by traversing the scan probes across the full face of the filter and the perimeter filter-to-housing seal surfaces. The scanning process shall be accomplished by mechanically positioning the probes from the exterior of the containment system without removing an access door or access cover or otherwise breaching the exterior pressure boundary of the housing. The probe assembly and scan testing process shall be designed and validated to meet the intent of IEST-RP-CC001.4 for scan testing type C HEPA filters. All ports for the scan testing process shall be 300 series stainless steel and identified with 300 series stainless steel labels attached to the housing. All probe assembly and mechanical scan test components of the in-situ scanning section shall be manufactured from Teflon coated aluminum, 304/304L stainless steel, polycarbonate, polyurethane, ABS or other materials that are chemically compatible with vaporous hydrogen peroxide and paraformaldehyde decontamination agents.

        2. The manufacturer shall provide detailed validation reports demonstrating the ability of the in-situ scanning section to locate and size leaks in both high-capacity and V-Bed HEPA filters with media leaks located in opposite corners of the filter as well as the center of the media pack with the filters operated at rated flow and 20% of rated flow, in both an initial orientation and rotated 180 degrees from the initial orientation. The validation report shall also demonstrate the ability of the system to detect gel or gasket leaks located along both the horizontal and vertical seal surfaces.

        3. Scan Probe Assembly

          1. The scan probe assembly shall consist of a drive assembly installed inside of the housing and a probe assembly coupled to the drive assembly. The drive assembly shall be designed and installed such that it may be operated from outside of the housing, causing the probe assembly to move linearly such that the probe transverses the entire face of the filter element which is being scanned. The opening of the probe assembly where the sample is taken shall be parallel to the face of the seal surface of the housing within 1 degree. The opening of the probe assembly shall also be maintained at a minimum distance of 0.5” and a maximum distance of 1.5” from the plane of the filter/housing seal surface and shall maintain a uniform distance as the probe traverses across the housing with maximum variation in distance from the plane of the filter/housing seal surface of ±0.125”.

          2. The drive assembly shall be self-lubricating and not require oiling or greasing of mechanical components in order to maintain operability over the service life of the equipment. The drive assembly shall include non-contact end-of-traverse detection of the probe assembly and provide feedback to the exterior of the housing to indicate end-of-traverse. The drive assembly and associated components shall be manufactured from T-304 stainless steel, Teflon coated aluminum, polycarbonate, polyurethane, ABS, Teflon or other materials that are chemically compatible with vaporous hydrogen peroxide and paraformaldehyde decontamination agents.

          3. The scan probe assembly shall meet the intent of IEST-RP-CC-034.2 regarding “overlapping” strokes when scan testing. This requirement ensures that the entire face area of the media is scanned. The probe assembly shall be designed, installed, and operate such that the entire face area of the filter media as well as the filter-to-housing seal is scanned in order to ensure that there is no bypass leakage around the filter element. The scan probe assembly shall consist of a minimum of two (2) individual scan probes for a ½-high system and four (4) individual scan probes for a 1-high system. Each scan probe shall be connected to a quick-release fitting installed on the front of the housing using flexible tubing and stainless steel hardware. The scan probe assembly shall be manufactured from chemical resistant, static dissipative polycarbonate and the flexible tubing shall be manufactured from static dissipative polyurethane. Both shall be chemically compatible with vaporous hydrogen peroxide and paraformaldehyde decontamination agents.

          4. The quick-release fittings installed on the exterior of the housing connected to the scan probes via the flexible tubing shall be manufactured from type 304 stainless steel and feature an integral bubble-tight check valve with VITON seals. The fitting design shall be such that accidental or inadvertent operation of the check valve is not possible without the use of tools, appliances, or other hardware. Each fitting shall be uniquely color-coded and mechanically keyed so that only one (1) mating fitting will fit each of the quick-release fittings. This ensures that the sample lines from the control system are connected to the proper quick-release fittings, which is critical in order to ensure accuracy of the scan test results.

          5. Penetrations through the pressure boundary of the housing that may be required for the drive assembly, scan assembly and associated hardware shall be sealed such that they meet the pressure decay requirements of Section 3.0 during both static (non-operational) and dynamic (scanning) states.

      7. Decon Port Assemblies

        1. These ports shall be installed on each filter train as shown on the drawings and shall be compatible with the User’s decontamination equipment. Unless otherwise specified, each port shall consist of a reinforcement plate welded to the housing side wall, 3 inch IPS Schedule 40, stainless steel pipe nipple, 3 inch IPS stainless steel pipe flange, 3 inch IPS butterfly valve and 3 inch female IPS aluminum hose connection with dust plug. The butterfly valve shall be wafer style, lever operated, and shall be bubble-tight at 150 psi. It shall have a cast iron body, aluminum bronze disc, stainless steel stem and EPDM seat.

    3. COMMON HOUSING ACCESSORIES

      1. Mounting Skid Base

        1. Each filter train shall be supported by a 3 inch high by 2 inch wide, 11 gauge type 304/304L stainless steel channel base. The channel base shall be intermittently welded to the filter train.

      2. Differential Pressure Gages

        1. Differential pressure gages shall be Dwyer Series 2000 Magnehelic pressure gage or equal. Unless otherwise indicated select gage scale ranges to read at 75 percent full range (rounded up) at the expected dirty filter pressure drop. Typical ranges follow:

          1. Filters with 25 to 30% efficiency 0 - 1.0 inches water column
            based on atmospheric dust spot
            test

          2. Filters with 31 to 99% efficiency 0 - 3.0 inches water column
            based on atmospheric dust spot

          3. HEPA filters 0 - 3.0 inches water column

        2. Gages shall be furnished for each filter bank, including gauges across each individual filter bank in built-up rack assemblies, suitable for flush mounting in a panel. All sensing tubing shall be 1/4 inch O.D. 300-series stainless steel tubing.

        3. Differential Pressure Gages Ports

          1. Static pressure ports shall be located on the filtration unit upstream and downstream of each prefilter, intermediate filter and HEPA filter bank. The port connections shall be 1/4 inch 300 series stainless steel pipe half-couplings.

        4. In-Line Gage HEPA Filters

          1. In-line gage HEPA filter shall be Camfil Farr Gage Guardian air filter, designed to protect diaphragm pressure indicating instrumentation (i.e. Magnehelic Gages, Photohelic Gages, etc.) from particulate contaminants.

          2. Due to life safety concerns, and considering that the integrity of the pressure boundary of these filters is as critical as that of the containment housing, each filter shall be factory tested to assure it is leak free and bubble-tight at a pressure of +20” w.g. by submerging the entire filter assembly in water, pressurizing the assembly to +20” w.g. and visually inspecting for leaks. The presence of a single bubble generated by this method constitutes a leak. Each filter shall have a label indicating that it was leak tested. The filter media shall be hydrophobic with a minimum efficiency of 99.9995%. The filter body shall be manufactured from T-304 stainless steel with silicone gaskets or O-rings to ensure long service life. All wetted surfaces of the filter shall be chemically compatible with vaporous hydrogen peroxide and paraformaldehyde decontamination agents.

        5. Gage Decontamination Ports

          1. These ports shall be installed in the gage lines between the containment housing and gage(s) as shown on the drawings and shall be compatible with commercially available vaporous hydrogen peroxide and paraformaldehyde decontamination systems. Each port shall consist of a stainless steel ball valve with a 3/8” female NPT connection allowing for connection to commercially available paraformaldehyde or vaporous hydrogen peroxide decontamination system to enable decontamination of the gage lines and in-line HEPA filter.

        6. Gage Calibration Line

          1. As shown on the drawings, stainless steel shutoff valves shall be provided to isolate each gage from the process stream. A stainless steel equalization valve shall be installed between the high and low pressure sides of each gage in such a manner that when the shutoff valves are closed, and the equalization valve is open, the pressure across the gage equalizes for calibration purposes without the possibility of venting to the ambient space. Shutoff and equalization valves shall be 300 series stainless steel.

      3. Lifting Lugs

        1. Lifting lugs shall be provided on the housing as required. Lifting lugs shall be fabricated from 1/4 inch plate of the same material as the housing. Lifting lugs shall have a minimum of 1-1/2 inch diameter eyeholes and be located on the [top] [side] of the housing. Lifting lugs shall be capable of supporting the housing (less adsorbers and filters) without causing housing deflection during transport and installation.

        2. All portions shall be free of sharp edges and burrs. Six (6) lifting lugs are required on each double HEPA assembly, and four (4) on each single HEPA assembly.

      4. Filter Change-out Tray

        1. Camfil Farr shall provide a filter change-out tray to aide in filter installation and removal or in the Bag-in/Bag-out procedure. All of the components of the change-out tray shall be type 304/304L stainless steel. The tray shall be designed to withstand the load of (1) filter and shall be installed over the top two door studs and use the existing hardware to be secured to the housing. One (1) tray per filter size shall be furnished.

      5. Banding Kit

        1. One complete banding kit shall be provided with the filtration unit(s) equipped with a bag-in/bag-out assembly. The banding kit shall provide a secure clamping of the bag between the housing and the spent filtration element. Each kit shall contain a heavy duty tie-banding tool, a bag cutting tool, 1/4 inch socket wrench w/ 3 inch long extension, 1-5/16 inch hex socket, a 13 inch cinching strap with buckle fastener, a set of ten (10) 100 pound tensile strength 14 inch long plastic ties, a set of twenty (20) stainless steel bands, and a plastic case/apron. The banding kit and change-out bags shall be manufactured by the same manufacturer as the housing. Additional tools required to complete the bag-in/bag-out procedure shall also be provided.

    4. FILTERS

      1. Prefilters

        1. General

          1. Filter shall be Camfil Farr 30/30 or equal.

          2. Air filters shall be medium efficiency ASHRAE pleated panels consisting of cotton and synthetic media, welded wire media support grid, and beverage board enclosing frame.

          3. Sizes shall be noted on drawings or other supporting materials.

        2. Construction

          1. Filter media shall be a cotton and synthetic blend, lofted to a uniform depth of 0.15”, and formed into a uniform radial pleat.

          2. A welded wire grid, spot-welded on one-inch centers and treated for corrosion resistance shall be bonded to the downstream side of the media to maintain radial pleats and prevent media oscillation.

          3. An enclosing frame of no less than 28-point high wet-strength beverage board shall provide a rigid and durable enclosure. The frame shall be bonded to the media on all sides to prevent air bypass. Integral diagonal support members on the air entering and air exiting side shall be bonded to the apex of each pleat to maintain uniform pleat spacing in varying airflows.

        3. Performance

          1. The filter shall have a Minimum Efficiency Reporting Value of MERV 8 when evaluated under the guidelines of ASHRAE Standard 52.2-2007. It shall also have a MERV-A of 8 when tested per Appendix J of the same standard. The media shall maintain or increase in efficiency over the life of the filter.

          2. Initial resistance to airflow shall not exceed 0.23”, 0.31” or 0.27” w.g. at an airflow of 350, 500 or 500 fpm on 1”, 2” or 4” deep models respectively.

          3. The filter shall be classified by Underwriters Laboratories as UL Class 2.

          4. Manufacturer shall provide evidence of facility certification to ISO 9001:2000.

          5. Manufacturer shall guarantee the integrity of the filter pack to 2.0” w.g.

        4. Supporting Data

          1. Provide product test report including all details as prescribed in ASHRAE Standards 52.2, including Appendix J.

      2. HEPA Filter (High Capacity)

        1. General

          1. Air filters shall be Camfil Farr model 12XH Absolute or engineer-approved equal. Air filters shall be HEPA grade high-capacity air filters with waterproof micro glass fiber media, tapered corrugated aluminum separators, urethane sealant, galvannealed 16-gauge steel enclosing frame, and gasket. Sizes shall be as noted on drawings or other supporting materials.

          2. Sizes shall be as noted on drawings or other supporting materials.

        2. Construction

          1. Filter media shall be one continuous pleating of microglass fiber media.

          2. Pleats shall be uniformly separated by tapered corrugated aluminum separators incorporating a hemmed edge to prevent damage to the media.

          3. The media pack shall be potted into the enclosing frame through the use of a urethane sealant.

          4. The enclosing frame of galvannealed 16-gauge steel shall be bonded to the media pack and form a rugged and durable enclosure. The filter shall be assembled without the use of fasteners to assure no frame penetrations. Overall dimensional tolerance shall be correct within -1/8”, +0”, and square within 1/8”.

          5. The filter shall be a fluid seal type and include a sealing channel on the downstream side of the enclosing frame filled with a non-Newtonian fluid to create a positive seal between filter and filter housing. Filter removal clips shall be located on the upstream side of the enclosing frame.

        3. Performance

          1. The filter shall have a tested efficiency of 99.99% when evaluated under the guidance of IEST Recommended Practice. Each filter shall be labeled as to tested performance.

          2. Initial resistance to airflow shall not exceed 1.35” w.g. target at rated airflow.

          3. Filter shall be rated by Underwriters Laboratories as UL Class 1.

          4. Manufacturer shall provide evidence of facility certification to ISO 9001:2000.

          5. The filter shall be capable of withstanding 10” w.g. without failure of the media pack.

        4. Supporting Documentation

          1. The filter shall be labeled as to tested efficiency, rated/tested cfm, pressure drop and shall be serialized for identification.

      3. HEPA Filter (Very High Capacity)

        1. General

          1. Air filters shall be Camfil Farr model Filtra 2000 or engineer-approved equal. Air filters shall be absolute grade HEPA filters consisting of pleated media packs assembled in a V-bank configuration, polyurethane sealant, anodized aluminum enclosure and seamless sealing gasket. Sizes shall be as noted on enclosed drawings or other supporting materials.

        2. Construction

          1. Filter media shall be micro fiber glass formed into minipleat pleat-in-pleat V-bank design.

          2. The media packs shall be potted into the enclosing frame with fire retardant polyurethane sealant.

          3. An enclosing frame of anodized extruded aluminum shall form a rugged and durable enclosure.

          4. The filter shall be a fluid seal type and include a sealing channel on the downstream side of the enclosing frame filled with a non-Newtonian fluid to create a positive seal between filter and filter housing. Filter removal clips shall be located on the upstream side of the enclosing frame.

        3. Performance

          1. Filter efficiency shall be 99.99% when evaluated according to the IEST Recommended Practice. Each filter shall be labeled as to tested performance.

          2. Initial resistance shall be 1.0” w.g. target at rated airflow.

          3. Filter shall be qualified as UL 586 and UL 900 Class 2 per Underwriters Laboratories.

          4. Manufacturer shall provide evidence of facility certification to ISO 9001:2000.

        4. Supporting Documentation

          1. The filter shall be labeled as to tested efficiency, rated/tested cfm, pressure drop and shall be serialized for identification.

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