suitable devices for exhaust pipe attachment. The adapter shall fit
[_____] mm inch nominal diameter exhaust pipe.
2.7.2
Welding Fume Receptors
Welding fume receptors shall be constructed of not less than 1.0 mm (20
gauge) 20 gauge thick aluminum and shall be equipped with 13 mm 1/2 inch
mesh receptor screens; shall have swivel connections, and magnets on
receptor base.
2.7.3
Flexible Exhaust Hose
Flexible exhaust hose shall be [0.30 mm 0.012 inch minimum strip thickness
of stainless steel] [0.30 mm 0.012 inch minimum strip thickness of
galvanized steel] [approved heat-resistant wire-reinforced glass fiber and
neoprene tubing] [approved heat-resistant wire reinforced glass fiber and
silicone tubing]. [Wye connectors shall be provided where shown].
Flexible tubing inside diameter and length shall be as shown. The tubing
shall be connected to the bottom of the ductwork. A flanged connection
shall be provided where the flexible tubing and overhead ductwork are
joined. The flanged connection shall consist of steel flanges not less
than 200 mm 0.078 inch thick, 3.175 mm 1/8 inch gasket. The gasket shall
be suitable for the system design temperature shown, in accordance with
ASME B16.21, full face or self-centering flat ring type. It shall contain
aramid fibers bonded with styrene butadiene rubber (SBR) or nitrile
butadiene rubber (NBR). The flange shall be sized or designed to suit the
hose as approved. [The connection of the neoprene hose may be installed
with an approved hose clamp or as recommended by the manufacturer.]
2.7.4
Exhaust Hose Suspension System
The exhaust hose suspension system shall suspend the flexible tubing
overhead when not in use; allowing it to be lowered to the operating level,
when required. The suspension system shall be furnished complete with
cable, and operating mechanism. The suspension system shall be
[counter-weighted type]or [manually operated balancer type with safety
ratchet lock or automatic brake having slip resistant hand grip].
2.8
DAMPERS
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NOTE: Indicate the location of dampers and the
types required. Details of the dampers will be
shown on the drawings. Shutoff dampers may be shown
on the drawings to be provided at each individual
tailpipe exhaust adapter. The use of these dampers
at inactive stations will reduce infiltration and
may reduce the energy required for heating. When
shutoff dampers are provided in the individual
branch tailpipe adapters, the exhaust fan capacity
shall be adjusted for systems which have four
stations. Systems having more than four branches
provided with shutoff dampers shall have a fan
capacity equal to four branches plus 50 percent of
the capacity of the number of branches over four.
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Dampers shall be of the type indicated and installed where shown. Dampers
shall be of the circular disk type with quadrant locking device or blast
SECTION 15940A
Page 12
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