discontinuity. Provide connection to ground and continuity testing as part
of the work of Division 16.
3.1.3
Special Installation Requirements
Special installation requirements for protectively coated steel ductwork
for corrosive fume and vapor exhaust: Slope horizontal ducts [25] [_____]
mm in [12] [_____] meters [one] [_____] inch in [40] [_____] feet in the
direction of air flow or [25] [_____] in [3] [_____] meters [one] [_____]
inch in [10] [_____] feet in the direction opposite to airflow. Where
necessary, slope duct to common drainage point. Provide drains at low
points, at internal duct restrictions, at base of risers and where
indicated. Provide drain connections of 25 mm one inch pipe size corrosion
resistant steel couplings welded to duct and provided with
polytetrafluoroethylene paste lubricated PVC plug where drainage piping is
not indicated. Provide drain lines with a trap of 25 mm one inch greater
depth than the positive or negative pressure in the duct but not less than
50 mm 2 inches. Provide duct support system to include additional weight
due to collection or [condensate] [and] washing water in nondrainable
deflected surface and other areas. Provide duct supports and building
structure attachments in accordance with SMACNA Rectangle Duct Const and
SMACNA Rnd Duct Const.
3.1.4
Special Requirements for Installation of Thermoplastic Ductwork
Requirements for installation of thermoplastic ductwork for nonflammable
corrosive fume and vapor exhaust:
3.1.4.1
Slope
Slope horizontal ducts [25] [_____] mm in [12] [_____] meters [one] [_____]
inch in [40] feet in the direction of airflow or [25] [_____] in [3]
[_____] meters [one] [_____] inch in [10] [_____] feet in opposite to the
direction of airflow. Where necessary, slope duct to common drainage point.
3.1.4.2
Drains
Provide drains at all low points, at internal to duct drainage
restrictions, at base of risers, and where indicated. Provide drain
connections of 25 mm one inch IPS couplings with polytetrafluoroethylene
paste lubricated plug where drainage piping is not indicated, and where
piping is indicated, provide PVC Type DWV piping conforming to ASTM D 2665
to points indicated. Provide trap of 25 mm one inch greater depth than the
positive or negative pressure in the duct but not less than 50 mm 2 inches.
3.1.4.3
Duct Supports
Isolate duct support contact surfaces from supporting steel by 6 mm 1/4 inch
thick closed-cell foamed cellular elastomer insulation material of a width
greater than support. Provide duct support system to include additional
weight due to collection of condensate and washing water in nondrainable,
deflected surface and other areas.
3.1.5
Special Requirements for Installation of Fiberglass Ductwork
Requirements for installation of fiberglass ductwork for nonflammable
corrosive fume and vapor exhaust:
SECTION 15801N
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