2.1.2
Propeller Fans
AMCA 210 with AMCA seal, [direct] [or] [V-belt] drive motors. Furnish fans
with a three-conductor neoprene-covered flexible cable, (Type SO), and a
three-prong attachment plug. [Provide for connection of permanent wiring.]
Provide shaped steel or steel reinforced aluminum blade impeller with
heavy hubs, statically and dynamically balanced, [keyed and] locked to
shaft.
2.1.3
Vaneaxial Fans
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NOTE: Use automatically variable speed motor or
adjustable variable pitch blades for vaneaxial
return fans in VAV systems.
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AMCA 210 with AMCA seal, [direct-drive motors of totally-enclosed
air-cooled (TEAC) type] [V-belt drive motors, adjustable, with external
belt guards]. Provide with adjustable die cast aluminum alloy [or glass
reinforced polyster resin] air-foil impeller blades. Die cast aluminum
alloy or cast iron hub with diameter of the fan hubs at least equal to that
of the motor frame. [The hubs shall be indexed for direct-driven fans,
with automatically adjustable variable pitch blades to facilitate setting
the angle of blades from minimum to maximum angle.] [In lieu of variable
pitch blades, variable speed motor may be used.] In the fan nameplate
data, include the factory blade setting and the maximum setting for the
motors. Guide vanes, adjustable inlet vanes, inlet bell, and outlet cones
shall be constructed of steel. [Provide galvanized steel welded grid inlet
screens to fit inlet bell.]
2.1.4
Power [Roof] [and] [Wall] Ventilators
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NOTE: For naval facilities at Adak, Alaska, the
entire assemblies of roof top or wall equipment
shall be structurally strong enough to resist 200
km/hr 125 miles per hour wind force. In the third
sentence of paragraph entitled "Power [Roof] [and]
[Wall] Ventilators," delete "mounted under fan
housings" for wall ventilators.
**************************************************************************
UL 705 with UL label and AMCA 210 with AMCA seal, [centrifugal] [propeller]
[V-belt] [direct driven] fans in [low-silhouette] [spun aluminum] housings
high-impact plastic with glass fiber reinforcement. Equip motors with
unfused safety disconnect switches [mounted under fan housings] and
resilient mounts. [Mount motors out of air stream.] [Provide
factory-fabricated roof curbs with continuous curb gaskets and aluminum
bird screen.] [Provide gravity actuated, aluminum multiple blade
construction backdraft damper and cast iron or steel sheaves, dynamically
balanced and bored to fit shafts and keyed.]
2.1.5
In-Line Tubular Centrifugal Fans
AMCA 210 with AMCA seal, welded tubular steel casings, [tubular centrifugal
backward-inclined] [or] [axial propeller] blades, stationary discharge
conversion vanes, belt guards, and adjustable motor-mounts. Provide
slip-fit or flanged connections between fan casings and ductwork. Air shall
SECTION 15720N
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