velocity of 2 1/2 m/s 500 fpm. Wind dirty medium with the dirty surface
inward, and reroll automatically. Each roll of medium shall be minimum 20
meters 65 feet long. Ship each roll of medium in a container which will
not permit seepage of adhesive to surface of container, regardless of the
position during shipment or storage. Replace stored rolls showing evidence
of seepage. Fabricate filter-supporting structural members of not less
than 14 gage (1.90 mm 0.0747 inch nominal thickness) steel for the base and
side panels and 16 gage (1.60 mm 0.0598 inch nominal thickness) steel for
top panel. Ship filters in major subassemblies or in fully assembled
sections. Prewire master sections. Run wiring in rigid conduit or steel
enclosed wire tunnels. Equip master section with a run-out switch to stop
the media movement and operate a signal light to indicate that the medium
from one of the sections has run out. Furnish a manual media-advance
switch with each drive unit to advance media to the end of the roll.
[Locate signal light on air handling units temperature-control panel.]
Media shall have an average synthetic dust weight arrestance of minimum 75
percent efficiency, a dust holding capacity of minimum, [2 kilogram per
square meter] [200 grams per square foot] [_____], and an average
resistance of 112 Pa 0.45 inch water gage at [the design] [2 1/2 m/s 500
fpm] face velocity.
2.2.5.4
Disposable Cartridge Air Filters
**************************************************************************
NOTE: Disposable cartridge are filters with
efficiencies of 85 to 95 percent and electrostatic
air filters are intended for uses only in instrument
shops, hospitals, certain laboratories, and other
special buildings where extreme cleanliness is
required.
**************************************************************************
UL 900, Class 2, UL classified, and factory assembled. Provide filter
media of [cotton and synthetic fibers] [ultra-fine glass fibers] having [35
to 40] [50 to 55] [80 to 85] [90 to 95] percent average dust spot
efficiencies with maximum final resistance [188] [250] [300] Pa [0.75]
[one] [1.20] inch water gage and maximum face velocity 3 m/s 625 fpm.
Construct filter frame of [16] [_____] gage sheet steel or aluminum with
welded or riveted joints. Calk or gasket entire assembly to prevent air
leakage around frames.
2.2.5.5
Extended Media (Pleated) Air Filters
FS F-F-2790 [, permanent holding frame] and [filter housing with
factory-assembled [side] [or] [bottom] access]:
[a.
Pre-Filter (Type I): [Externally supported] [or] [nonsupported
(internally supported)] cartridge.
Efficiency: [20] [30] [40] percent rated.
Pre-Filter Track: Required.]
[b.
After-Filter (Type II): [Externally supported] [or] [nonsupported
(internally supported)] cartridge.
Efficiency: [85 (Grade C)] [95 (Grade D)] percent rated.]
[b. After-Filter (Type III): Self-supporting cartridge.
Efficiency: 95 (Grade E) percent rated on standard dioctyl-phthalate
(DOP) Test with 0.3 micron diameter particles.]
SECTION 15720N
Page 15
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