motors shall not exceed 1800 rpm and shall have [open] [dripproof] [totally
enclosed] [explosion-proof] enclosure. [Motor starters shall be [manual]
[magnetic] across-the-line with [general-purpose] [weather-resistant]
[explosion-proof] enclosure.] [Provide remote manual switch with pilot
indicating light where indicated.]
2.7.1.4
Panel Type Power Wall Ventilators
Fans shall be propeller type, assembled on a reinforced metal panel with
venturi opening spun into panel. Fans with wheels less than 600 mm 24
inches in diameter shall be direct or V-belt driven and fans with wheels
600 mm 24 inches diameter and larger shall be V-belt drive type. Provide
fans with wall mounting collar. Lubricated bearings shall be provided.
Equip fans with wheel and motor side metal or wire guards which have a
corrosion-resistant finish. Motor enclosure shall be [dripproof] [totally
enclosed fan cooled] [explosion-proof] type. Install [gravity] [motor
operated] backdraft dampers where indicated.
2.7.1.5
Centrifugal Type Power Wall Ventilators
Fans shall be [direct] [or] [V-belt] driven centrifugal type with backward
inclined, non-overloading wheel. Motor housing shall be removable and
weatherproof. Unit housing shall be designed for sealing to building
surface and for discharge and condensate drippage away from building
surface. Construct housing of heavy gauge aluminum. Equip unit with an
[aluminum or plated steel wire discharge bird screen,] [disconnect switch,]
[[anodized aluminum] [stainless steel] wall grille,] [manufacturer's
standard [gravity] [motor-operated] damper,] an airtight and liquid-tight
metallic wall sleeve. Motor enclosure shall be [totally enclosed fan
cooled] [dripproof] [explosion-proof] type. Use only lubricated bearings.
2.7.1.6
Centrifugal Type Power Roof Ventilators
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NOTE: Delete kitchen exhaust fan when not required.
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Fans shall be [direct] [or] [V-belt] driven centrifugal type with backward
inclined, non-overloading wheel. Motor compartment housing shall be hinged
or removable and weatherproof, constructed of heavy gauge aluminum.
Provide fans with [birdscreen,] [disconnect switch,] [[gravity] [motorized]
dampers,] [sound curb,] [roof curb,] and [extended base]. Motors enclosure
shall be [dripproof] [explosion-proof] type. Kitchen exhaust fans shall be
centrifugal type according to UL 705 and fitted with V-belt drive, round
hood, and windband upblast discharge configuration, integral residue trough
and collection device, motor and power transmission components located in
outside positively air ventilated compartment. Use only lubricated
bearings.
2.7.1.7
Propeller Type Power Roof Ventilators
Fans shall be [direct] [or] [V-belt] driven. Fan housing shall be hinged
or removable weathertight, fitted with framed rectangular base constructed
of aluminum or galvanized steel. Motors shall be [totally enclosed fan
cooled] [explosion-proof] type. Furnish motors with nonfusible, horsepower
rated, manual disconnect mount on unit. Furnish fans with [gravity] [motor
operated] dampers, [birdscreen] [sound curb] [roof curb]. Use only
lubricated bearings.
SECTION 15895
Page 29
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