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6. COMMERCIAL
DUCTWORK AND PLENUM
6.1 APPLICATION
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C. LINER INTERNAL APPLICATION
Specification
Code No.
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CIR/1 |
Rigid Duct Liner |
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– Preparation: Fix mechanical fasteners
to both horizontal and vertical surfaces at approximately
300 mm centres each direction.
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Application: Cut insulation material to required size and
apply to interior of duct and/or plenum with horizontal
surfaces overlapping vertical surfaces and with edges tightly
butted together. Insulation shall be applied to the ductwork
with a minimum 90% coverage of adhesive and mechanical
fasteners. Where mechanical fasteners penetrate factory
finish and at all joints, apply a heavy layer of seal coating.
On high velocity duct systems 20.32 m/s to 30.48 m/s apply
reinforcing membrane over the entire insulation surface.
Seal off leading edge of insulation to duct surface with
reinforced seal coating. |
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CIF/1
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Flexible Duct Liner
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– Preparation: Fix mechanical fasteners
to both horizontal and vertical surfaces at approximately
300 mm centres each way.
–Application: Cut insulation material
to required size and apply to interior of duct, edges tightly
butted together.
Insulation shall be applied to the ductwork with a minimum
90% coverage of adhesive and mechanical fasteners. Where
mechanical fasteners penetrate factory finish and at all
joints, apply a heavy layer of seal coating. On duct systems
having a 10.16 m/s to 20.32 m/s velocity, reinforce the
joints with seal coating and reinforcing membrane. Seal
off leading edge of insulation to duct surface with reinforced
seal coating.
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Note 1: Except where specifically called for
in the Insulation section of the project specifications, where
an interior duct liner is used, external insulation shall not
be applied.
Note 2: Internal insulation shall not be applied
to duct work that is below ambient temperature. |
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