component type, not requiring primed substrate, with manufacturer
published estimated life of 20 years and a maximum 10 percent
shrinkage when cured.
c.
Polysulfide: Conforming to FS A-A-1556, Type 2, Class A, single
component type, not requiring primed substrate, with manufacturer
published estimated life of 20 years and a maximum 10 percent
shrinkage when cured.
d.
Polyisobutylene/Butyl: Conforming to FS A-A-272, Type 1, single
component type, not requiring primed substrate, with manufacturer
published estimated life of 10 years and a maximum 15 percent
shrinkage when cured.
e.
Acrylic Terpolymer: Conforming to FS A-A-1556, single component
type, not requiring primed substrate, with manufacturer's
published estimated life of 20 years and a maximum 10 percent
shrinkage when cured.
2.6.7.2
Heat Shrinking over Round Exterior Duct
High molecular weight, irradiated polyethylene band with interior heat
activated epoxy adhesive coating for heat shrinking and epoxy extrusion
over round, exterior, duct joints.
2.6.7.3
Hard Cast Caulking for Exterior Ducts
Mineral and adhesive impregnated woven fiber tape with adhesive activator
for exterior round or rectangular duct joints.
2.6.7.4
Caulking of Building Surface Penetration
Foamed silicones, two-component, fire-resistant, [gamma radiation
resistant], low-exotherm, room temperature vulcanizing silicone.
2.7
SPECIALTIES
Steel, cast iron, stainless steel, nonferrous metal, or plastic to match
duct construction, or as indicated.
2.7.1
Access Ports, Test
With gasketed screw cap and flange, to suit exhaust service[, 25 mm one inch
nominal pipe size].
2.7.2
Damper Regulators
Incremental position indicating and locking type, with satin finish chrome
plated, flush surface mounting cover and regulator box where concealment is
required in finished spaces. For splitter dampers, provide splitter tip
mounted trunnion brackets with self-locking screw regulator or rods with
external swivel joint brackets.
2.7.3
Blast Gates
Provide means for locking in adjusted position with bolt and nut.
SECTION 15801N
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