3.1.1.2
Dampers
When installed on ducts to be thermally insulated, equip each damper
operator with stand-off mounting brackets, bases, or adapters to provide
clearance between the duct and operator not less than the thickness of
insulation. Stand-off mounting items shall be integral with the operator
or standard accessory of damper manufacturer.
3.1.1.3
Deflectors
Provide in square elbows, duct-mounted supply outlets, take-off or
extension collars to supply outlets, and tap-in branch-off connections.
Adjust supply outlets to provide air volume and distribution as [indicated
or] specified.
3.1.1.4
Fire Dampers
Install in accordance with manufacturer's instructions for condition of UL
555 and NFPA 90A. Locate as indicated and provide surface penetration
sleeves in accordance with approved detail drawings.
3.1.1.5
Access Doors
Provide for automatic dampers, volume dampers, fire dampers, coils,
thermostats, temperature controllers, valves, filters, humidifiers and
other concealed apparatus requiring service and inspection in the duct
systems.
3.1.1.6
Duct Sleeves, Prepared Openings, and Closure Collars
Provide for ductwork penetrations in floors, walls, and partitions through
which metallic [and] [fibrous glass] ductwork passes.
a.
Duct Sleeves: Fill space between duct and sleeve or between
insulation and sleeve for insulated ducts with mineral fiber,
except at grilles, registers, and diffusers.
b.
Prepared Openings: Fill space between duct and opening or between
insulation and opening for insulated ducts with mineral fiber,
except at grilles, registers, and diffusers.
c.
Closure Collars: Fit collars snugly around ducts or insulation.
Grind edges of collar smooth to preclude tearing or puncturing
insulation covering or vapor barrier. Provide nails with maximum
150 mm 6 inch centers on collars.
[3.1.1.7
Fibrous Glass Duct
Install in accordance with SMACNA FGDCS, the manufacturer's printed
instructions, and UL 181. In addition to manufacturer's approved method,
seal joints with fibrous glass fabric and mastic. Fibrous glass ductwork
will not be allowed for the following:
a.
Square and rectangular ductwork operating over 500 Pa 2 inches
water gage static pressure or 10 meter per second2000 feet per
minute velocity;
b.
Exposed ductwork;
SECTION 15810N
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