15840-2
DUCTWORK AND DEVICES
PART 2 - PRODUCTS
2.1 MATERIALS
A.
F.
All ducts, devices and accessories except PVC ducts and other ducts noted on
drawings shall be constructed to SMACNA 2-inch water gage (w.g.) classification
for both vacuum and pressure applications.
Ducts, devices and accessories shall be constructed of materials as noted below and
on the Drawings.
1. Galvanized Steel - Control Building
2. Aluminum 3003 alloy H14 temper per ASTM B209 or 5052 alloy H32
temper. - Grit Building, Sludge Processing Building
All longitudinal and traverse joints, seams and connections of supply and return
ducts operating at a static pressure less than or equal to 2 inches water gauge (w.g.)
shall be securely fastened and sealed with welds, gaskets, mastics (adhesives),
mastic plus embedded fabric systems or tapes installed in accordance with the
manufacturers installation instructions.
Insulation: Ducts requiring insulation shall use materials specified in the "Duct
Insulation" Section in this Division. Note that duct sizes shown are inside clear
dimension, not necessarily sheet metal size.
Diffusers, grilles, and registers:
1. All air devices shall be supplied by a single manufacturer.
2. Acceptable manufacturers:
Price.
Nailor.
Tuttle & Bailey.
Anemostat.
Titus.
Manufacturers with equivalent diffusion pattern, air throw, velocity, and
sound level.
Fire Damper: Equal to Ruskin DIBD2, Style B or Style C and UL listed.
moaoce
PART 3 - EXECUTION
3.1 INSTALLATION
A.
Elbows, vaned elbows, take-offs, branch connections, transitions, splitters, duct
volume dampers, fire dampers, flexible connectors, and access doors shall conform
to SMACNA Duct Construction Standards.
Install duct so that ductwork shall operate without chatter, vibration, and be air tight
so that no dust marks from air leaks will show at connections or outlets.
Field Changes to Ductwork: Design changes such as those required to suit the size
of factory fabricated equipment actually furnished to minimize losses in pressure
and performance due to sudden expansion and contraction. Use transitions in field
changes as well as modifications to connecting ducts.
Splitters and Dampers: Dampers shall have accessible operating mechanism, and
where operators occur in finished portions of the building, operators shall be
chromium plated with all exposed edges rounded. Splitter dampers shall be operated
by quadrant operators or 3/16-inch rod brought through the side of the duct with
13089K
