F, leaded sheet vinyl, a minimum 1.40 mm 0.055 inchesthick, weighing a
minimum 20.60 kg per square meter 0.87 pounds per square foot, capable of
10 dBA attenuation in 10 to 10,000 Hz range, suitable for solvent seam or
overlap joining and banding.
2.6.3.3
[Fume] [Dust Collection] Service
[3 mm][1/8 inch] [_____] thick, single-ply, synthetic fabric reinforced
chloroprene suitable for 107 degrees C 225 degrees F.
2.6.3.4
High Temperature Service
a.
Bellows type metal expansion joints, temperature range minus 29
degrees C to [427] [538] degrees C 20 degrees F to [800] [1000]
degrees F, plus or minus 25 kPa 100 inches water gage [with
interior liner [and exterior cover]].
b.
Fabric reinforced, insulated, elastomeric cover expansion joint
for operating temperature up to [204 degrees C] [400 degrees F]
[_____] [belt] [or] [flange] type for [10 kPa gage] [40 inches
water gage] [_____] positive or negative pressure [, with interior
liner or baffle].
2.6.4
Flexible Duct
**************************************************************************
NOTE: The designer shall indicate on the drawings
the types of flexible duct required.
**************************************************************************
2.6.4.1
Metallic Type
Single-ply [zinc-coated carbon steel] [mill galvanized carbon steel] [Type
316 stainless steel] [two-ply aluminum], [self-supporting to 2.50 meters 8
foot spans] with corrugated and interlocked, folded and knurled type seam
construction, bendable without damage through 180 degrees with a throat
radius approximately 10 times the duct diameter, airtight, rated for
positive or negative working pressure of 3735 Pa 15 inches water gage at [
177 degrees C 350 degrees F for aluminum] [343 degrees C650 degrees F for
galvanized steel and stainless steel] UL 181, Class 1 rated, conforming to
NFPA 91.
2.6.4.2
Wire Reinforced Fabric Type
Elastomer impregnated woven synthetic fabric, bonded to and supported by
corrosion protected or corrosion resistant spring steel helix, rated for
positive or negative working pressure of [3735 Pa gage at 121 degrees C]
[15 inches water gage at 250 degrees F] [_____] UL 181, Class 1 labelled.
Provide with manufacturer's standard metallic connection collar and
clamping fastener assembly [fitted with] [dampers] [and] [extractors] [as
indicated].
2.6.4.3
Ball Joints
Fabricated from cast iron or formed sheet metal with outer sections secured
with bolts. Provide each half of the ball joint with tubular stubs for
connecting ducts.
SECTION 15801N
Page 22
Previous Page
