sleeve type, self-aligning and self-oiling with oil reservoirs, or
precision self-aligning roller or ball-type with accessible grease fittings
or permanently lubricated type. Grease fittings shall be connected to
tubing and serviceable from a single accessible point. Bearing life shall
be L50 rated at not less than 200,000 hours as defined by ABMA 9 and ABMA 11.
Fan shafts shall be steel, accurately finished, and shall be provided with
key seats and keys for impeller hubs and fan pulleys. Each fan outlet
shall be of ample proportions and shall be designed for the attachment of
angles and bolts for attaching flexible connections. Motors, unless
otherwise indicated, shall not exceed 1800 rpm and shall have [open]
[dripproof] [totally enclosed] [explosion-proof] enclosures. [Motor
starters shall be [manual] [magnetic] [across-the-line]
[reduced-voltage-start] type with [general-purpose] [weather-resistant]
[watertight] enclosure.] [Remote manual switch with pilot indicating light
shall be provided where indicated.]
2.11.3
In-Line Centrifugal Fans
In-line centrifugal fans shall have welded tubular casings, centrifugal
backward inclined blades, stationary discharge conversion vanes, internal
and external belt guards, and adjustable motor mounts. Air shall enter and
leave the fan axially. Inlets shall be streamline with conversion vanes to
eliminate turbulence and discharge air flow smoothly. Fan bearings and
drive shafts shall be enclosed and isolated from air stream. Fan bearings
shall be sealed against dust and dirt and shall be permanently lubricated
or lubricative type with grease lines extending to the exterior of the
housing. Bearing life shall be L50 rated at not less than 200,000 hours as
defined by ABMA 9 and ABMA 11. Motors 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. [Remote manual switch
with pilot indicating light shall be provided where indicated.]
2.12
FACTORY COATING
Equipment and component items, when fabricated from ferrous metal as
defined by ASTM (or similar) standard, shall be factory finished with the
manufacturers standard finish except that items located outside of building
shall have weather-resistant finishes that will withstand 500 hours
exposure to the salt spray test specified in ASTM B 117.
PART 3
EXECUTION
3.1
EXHAUST SYSTEM RELATED SUBMITTALS
The Exhaust System Specialist shall prepare a list of the submittals from
the Contract Submittal Register that relate to the successful installation
of the exhaust systems(s). The submittals identified on this list shall be
accompanied by a letter of approval signed and dated by the Exhaust System
Specialist when submitted to the Government.
3.2
INSTALLATION
Work shall be installed as shown and according to the manufacturer's
diagrams and recommendations.
3.3
INSPECTION BY EXHAUST SYSTEM SPECIALIST
The Exhaust System Specialist shall inspect the exhaust system
SECTION 15940A
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