2.2.3
Utility Set[s]
Single-width, single-inlet, nonoverloading scroll type. Scroll shall be
[intermittently] [or] [continuously] welded [carbon] [Type [304L] [316L]
stainless] [steel] [_____ alloy aluminum] with required reinforcement,
[flanged inlet and outlet connections], streamline orifice inlet bolted
[and gasketed] to scroll side sheet, [threaded and] [plugged] [piped]
[scroll drain,] [access door with gasket]. [Carbon] [Type [304] [316]
stainless] [steel] [monel] shaft finished as required [and fitted with]
[heat slinger] [shaft seal] [grease lubricated stuffing box]; welded
[carbon] [Type [304L] [316L] stainless] [steel] [_____ alloy aluminum]
impeller assembly; [backward inclined] flat or single thickness airfoil
type impeller blades. Provide protective coating of [_____] for [fan
surfaces exposed to [air] [fume] [vapor] stream and weather.] Motor and
power transmission components shall be enclosed in ventilated weathertight
hood. [Discharge shall be fitted with an automatic gravity shutter
constructed from [specified stainless steel] [aluminum].] [Mount complete
assembly from individual points of support on rails and vibration isolated
by double-rubber-in-shear mountings] [conforming to requirements indicated].
2.2.4
In-line Centrifugal Fans
Welded steel casings, centrifugal backward inclined blades, stationary
discharge conversion vanes, internal and external belt guards and
adjustable motor mounts. Inlet and outlet connections for fan casings to
duct work and equipment casings, may be of the slip fit or flanged type.
[Provide guards for discharges. Rate fans with guards in place.] Air
shall enter and leave the fan axially. Inlet shall be streamlined and
conversion vanes shall eliminate turbulence and provide smooth discharge
air flow. Enclose fan bearings and drive shafts, and isolate from the air
stream. Fan bearings shall be mechanically sealed against dust and dirt
and shall be self-aligning, pillow block ball or roller type. Motor and
drive shall be provided by fan manufacturer.
2.2.5
Fiberglass Centrifugal Fans
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NOTE: Show intended service on drawing fan schedule
or specify here. Revise paragraph if special
accordance with manufacturer's recommendations.
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ASTM D 4167. Construct of fire retardant fiberglass with a flame spread
rating at least equal to or less than that of the duct system. Housing and
fan impeller shall be fiberglass. Shaft and fan support stand shall be
steel with protective coating. Provide exterior gel coat, coating, or
paint with ultraviolet light inhibiting properties for fans exposed to
sunlight. Fiberglass fans shall be suitable for [the intended service.]
[use in [_____]]. Provide with flanged outlet [and inlet] connections,
[threaded [and plugged]] scroll drain, bolted access and inspection doors,
and epoxy coated steel fan base and motor mount.
2.3
[VANEAXIAL] [TUBEAXIAL] FANS
Direct-connected with adjustable blade impeller or V-belt driven. When
direct connected, fans shall be driven by totally-enclosed, air-over
(TEAO), flanged or end mounted motors. When belt-driven, provide internal
and external belt guards and adjustable motor mounts.
SECTION 15801N
Page 19