housing] [, and bearing and motor pedestal]. Do not coat bearings,
coupling, motor, drive, or other auxiliaries. [Prepare and coat stainless
steel shaft.] [Finish fan in accordance with the manufacturer's standard
practice.] [Coat fan with [phenolic] [epoxy] [_____].] [Coat fan as
indicated.] Statically and dynamically balance the fan in two planes after
coating and finishing, and where material has been removed, refinish and
rebalance the fan as specified herein.
2.2
CENTRIFUGAL FANS
2.2.1
General Requirements for Centrifugal Fans
**************************************************************************
NOTE: See Section 15070, "Mechanical Sound,
Vibration, and Seismic Control," for guidance given
in guide specification technical notes. Definite
requirements should be specified in contract
specification for bidders' information.
**************************************************************************
Provide fan of [forward-curved] [radial] [backward inclined] [airfoil] type
blades with [manual] [or] [automatic inlet vanes [as indicated]]. Arrange
fans for indicated service, and construct for the applicable AMCA 99Class
pressure ratings as indicated for system design pressure and temperature.
Fan shaft shall be solid steel, ground and finished as required for the
service, with first critical speed a minimum 25 percent higher than
cataloged fan speed. Select fan for maximum efficiency, minimum noise, and
stability during all modes of system operation. [Vibration isolation
mountings shall be spring type and limit vibration transmissibility to a
maximum [_____] [5] percent of the unbalanced force at lowest equipment
speed, unless otherwise specified or indicated.] Arrangement and drives
shall be as indicated.
2.2.2
Industrial Exhauster[s]
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NOTE: Use industrial exhausters for high
particulate loading applications.
**************************************************************************
Single-width, single-inlet type arranged for indicated service and
constructed for duty at indicated system design pressure and temperature
not to exceed [66] [93] [177] [260] [371] degrees C [150] [200] [350] [500]
[700] degrees F. Continuously welded [carbon] [alloy] [copper bearing
alloy] [Type [_____] [304L] [316L] stainless] [steel] [[_____] alloy
aluminum] scroll with required reinforcement, flanged inlet and outlet
connections, [cone] inlet [bolted] [welded] to scroll side sheet, threaded
and plugged scroll drain, [quick] [or] [bolted] access door with gasket;
[Carbon] [alloy] [Type [_____] stainless] steel shaft, [fitted with] [heat
slinger] [shaft seal] [grease lubricated stuffing box]; continuously welded
[carbon] [alloy] [copper bearing alloy] [Type [_____] [304L] [316L]
stainless] [steel] [_____ alloy aluminum] impeller assembly. [_____]
[radial] [paddle type (open radial)] [backplated paddle] type impeller
blades [with inlet shroud]. [Provide protective coating of _____.] on fan
surfaces exposed to [air] [fume] [vapor] stream; [Motor shall be totally
enclosed type.] Mount complete assembly including motor, power
transmission components, and guards on a common vibration isolation base
with spring mountings [conforming to requirements indicated].
SECTION 15801N
Page 18
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