2.2.5.6
High Efficiency Particulate (HEPA) Air Filters
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NOTE: Use high efficiency particulate air filters
in "white" room, dust-controlled facilities, medical
facilities, and clean work stations.
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UL 586 and UL classified; minimum 99.97 percent efficiency to remove
0.3-micron diameter particles. Construct filters of continuously pleated
filter-media of honeycomb design or separated by corrugated inserts.
Correct overall frame dimensions and squareness to zero, minus 3 mm ot plus
3 mm 1/8 inch or plus 1/8 inch, respectively. Provide airtight joints with
frame retainers and gaskets. Air capacity and normal depth of the filters
shall be as indicated.
2.2.5.7
Filter Housing
Minimum thickness, 14 gage steel with baked finish inside and out.
Joints shall be continuously welded. Flange shall have a fixed air
sealing gasket with hollow cross section, closed cell rubber or resilient
neoprene, suitable for repetitive reuse. Cabinets shall have flanged ends
for connection to adjacent ducts. Hinged access doors on both cabinet
sides. Provide access doors with fixed air sealing gaskets to be airtight
at the static pressure expected in service. Provide two 10 mm 3/8 inch
Society of Automotive Engineers (SAE) flare connection test ports complete
with seal cap, one on each side of the filter. Weld test ports into each
filter cabinet or plenum. Test port shall not penetrate to filter frame or
media.
2.2.5.8
Odor Control
Factory-fabricated, charcoal type with multiple-cells of porous activated
carbon. Construct each filter cell with trays to retain the activated
carbon and with means to prevent the by-passing of air. Construct filter
frames of rigid and corrosion resisting materials.
2.2.6
Mixing Boxes
Include equally sized openings, sized to individually handle full air flow
capacity. Provide [automatic] [or] [manual] dampers.
2.2.7
Outside-Air Intake
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NOTE: Delete this paragraph if the central station
air handlers are not roof top units.
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Provide each roof top unit with a unit-mounted louver, built-in rain lip,
and bird screen.
2.2.8
[Heating] [and] [Cooling] Sections
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NOTE: ARI 210, 240, or 360, unitary air
conditioning equipment with direct expansion coil
are covered by Section 15730, "Unitary Air
Conditioning Equipment." Fan-coil units are covered
SECTION 15720N
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