2.8
TROFFERS
UL Classified and UL labeled. Factory-fabricated and constructed of
[steel] [or] [aluminum] and accessible for adjustment without requiring the
removal of troffer components or ceiling panels. Return and supply air
handling sections shall be interchangeable, except that distribution
plenums are not required for return sections discharging into the ceiling
plenums. Appearance of return and supply troffers shall be identical when
viewed from below ceiling. When returning air to the ceiling plenum, or
when not connected to supply air, the troffer shall have a maximum sound
transmission class rating of 40. Equip troffers with collars at least 50 mm
2 inches long for connection to ductwork.
2.8.1
Air Seal
Resilient plastic self-adhering pressure sensitive seal between the
diffuser and the frame of lighting fixtures.
2.8.2
Interior Dampers or Deflectors Finish
Black paint or anodized.
2.8.3
Lighting Fixture Characteristics
[As indicated] [and] [as specified in Division 16, Electrical].
2.9
DUCT SLEEVES, PREPARED OPENINGS, AND CLOSURE COLLARS
2.9.1
Duct Sleeves
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NOTE: Where sleeves are installed in the bearing
walls, the designer must provide design details in
drawings of the structural steel sleeves. Consult
with structural engineers for the design details.
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Fabricate from minimum 20 gage [galvanized steel] [aluminum]. Where
sleeves are installed in bearing walls, provide structural steel sleeves as
indicated. Size sleeves to provide 25 mm one inch clearance between duct
and sleeve or between insulation and sleeve for insulated ducts.
2.9.2
Prepared Openings
Provide 25 mm one inch clearance between the duct and the sleeve, or 25 mm
one inch clearance between insulation and sleeve for insulated ducts except
at grilles, registers, and diffusers.
2.9.3
Packing
ASTM C 553, Type 1, Class B-2, mineral fiber.
2.9.4
Closure Collars
100 mm Four inches wide minimum, fabricated from minimum 20 gage
[galvanized steel] [aluminum].
SECTION 15810N
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