Vanaire also can provide FM (Factory Mutual) approved Ductwork
Systems
DUCT WORK SYSTEMS
PVC, SOLID FIBERGLASS, CPVC POLYPROPYLENE, DUAL LAMINATE
Vanaire's CORROSION RESISTANT duct systems are fabricated in
accordance with the specifications set forth by the SMACNA
Manual on Thermoplastic Construction.
PVC DUCTWORK, SYSTEMS are fabricated from 3/16" Type II extruded
PVC (conforming to AS'TM-D-1784-69) in diameters 6" through
24" and 3/16" and 1/4" high impact Type II
PVC sheet stock (conforming to ASTM-D-1927-67) in diameters
greater
than 24". All elbows and fittings less than 20" are
buttwelded on a special buttwelder for fittings, to ensure
fitting is leakproof. All straight duct sections greater
than 24" are
longitudinally butt welded to guarantee the weld at 100%
of the material strength. All welding is done by Vanaire
welders, trained
and certified by Vanaire in the method of hot gas fusion
PVC welding. All factory joints are welded with no less than
four
PVC welds on each joint (three out and one in), to minimize
the possibility of leaks. All risen to have blast-gate or
locking
quadrant dampers.
Solid Fiberglass Round Duct is manufactured from chemical
resistant reinforced-thermoset resin in accordance with
product standard
PS-15-69. The size of round duct is determined by the
inside diameter.
Solid Fiberglass Ductwork is also available in filament
wound construction utilizing our state of the art filament
winding
machines.
Elbows: Standard elbows shall have a centerline radius
of one and one-half times the duct diameter.
Laterals: Standard laterals shall be 45 degrees.
Reducers, Concentric or Eccentric: Length
of standard reducers shall be five times the difference in
diameter (DI D2).
Minimum wall thickness shall be that required
for the larger diameter
duct.
Straight Connections: Vanaire's Standard joint
is the butt and wrap. Strength of the butt
joint shall
be
at least
equal to that
of the duct itself. Total minimum width of
joint shall be 3 inches for 1/8 inch thickness, 4 inches
for 3/16
inch thickness
4 inches
for 3/16 inch thickness, and 6 inches for 1/4
inch thickness.
Flanges: Flange diameter and thickness are as specified
in PS15-69 Rectangular flanges will be the same width and
thickness as that for diameters corresponding to the longer
sides. Unless specified otherwise, flanges will be un-drilled.
If drilling is specified, the number of bolt holes and diameters
of bolt holes and bolt circles shall be in accordance with
table.
All PVC and Fiberglass duct thickness and
reinforcement is designed based on SMACNA
requirements for
the static pressure
of the system.
Duct connections will be by coupling or
bell end, Flan connections are available as options
if requested.
All Vanaire systems are designed in accordance
with the manuals of recommended practice,
set forth by
the American
Conference
of Governmental Industrial Hygienists
(ACGIH), and the American National Standard Institute (ANSI). |
