supply-air duct connection at both plenum ends, and a cap for the unused
connection.
2.6.6
Air Nozzles
Heat-resistant thermoplastic or polypropylene. Operating conditions range
shall be minus 29 to plus 52 degrees C 20 to plus 125 degrees F and 875 Pa
3 1/2 inch water gage maximum pressure.
2.6.7
Dampers
Adjustable type for balancing primary air without removing enclosures.
2.7
ELECTROSTATIC (IONIZING) AIR FILTERS
**************************************************************************
NOTE: Do not use roll-type air filters unless
specifically requested by the Government. Air
filter per FS F-F-320 is for use only in
non-residential air cleaning systems.
**************************************************************************
[UL 867 and UL listed, [duct] [fixed] [portable] [or] [stationary] type.]
[Except as modified herein, FS F-F-320; Type [II (dry-plate type with wash
water and detergent system and permanent after-filters, ionizing type)]
[III dry-plate with disposable after-filter, ionizing type)] pf Style [A
(roll-type filter, vertical, standard design)] [B (roll-type filter,
vertical, compact design)] [C (roll-type filter, horizontal)] [D (extended
media type, Stationary filter)]; Class [1 (standard efficiency, 75 percent
minimum)] [2 (high efficiency, 95 percent minimum)]; Group [1
(factory-assembled)] [2 (field-assembled)]; and automatic controls. [For
roll-type filter, controls may be pressure-drop, timer, or timer with
pressure-drop override types. Provide runout switch to break control
circuit and turn on control-panel signal light at the end of media roll.
Filter media shall receive not less than 0.50 kilogram per square meter 50
grams per sq ft dust-holding capacity, with 75 percent efficiency at 2 1/2
m/s 500 fpm and average resistance of 112 Pa 0.45 inch water gage.]]
2.8
VARIABLE-AIR-VOLUME (VAV) TERMINAL UNITS
ARI 880; sound power level, capacities, static pressures, and other
operating conditions as indicated. Include sound-attenuator boxes,
variable-volume dampers, adjustable maximum air-volume regulators, and
other items for system operation. Equip units with integral air-volume
control dampers. Thermostats may be mounted in the units if room air is
induced over the thermostats. Maximum air-leak rate shall be 2 percent at
static pressures from 100 to 750 Pa 0.4 to 3 inch water gage.
2.8.1
Casings
Minimum 26 gage galvanized steel or minimum one mm 0.04 inch thick
aluminum, welded construction. Provide removable access panels where
required for inspection, adjustment, and maintenance without disconnecting
ducts.
2.8.2
Insulation
NFPA 90A and UL Classified for 2 hour fire-rated classification with
minimum [13 mm1/2 inch] [_____] [682 grams1 1/2 lb.] [_____] glass fiber.
SECTION 15720N
Page 22
Previous Page
