chemkor schedule 80 fittings - Fabco Plastics Wholesale Limited

Branches shall not be positioned directly opposite one another on
a main or a sub-main. The intersection of branches with mains
and sub-mains shall be continuously welded.
10. TRANSVERSE JOINTS
Hand welded butt joints may be used for connections wherever
desirable. For fi eld connections, however, it is recommended that
a bell and spigot or fl exible connection be used.
11. BUTT JOINT
A hand welded butt joint shall have a tensile strength at least
equal to 75% of the duct itself.
12. BELL AND SPIGOT INSTADUCT
Bell and spigot joints, are made by thermal forming of the end of
round duct. The straight duct shall be inserted into the bell end a
minimum of 2”.
13. INSTADUCT COUPLING JOINT
The coupling joint is thermally formed of a thickness equivalent
to or greater than that of the duct. The coupling is cemented to
the duct section.
14. FLEXIBLE CONNECTIONS
Flexible connections shall be provided to form an anti-vibration
barrier at the locations indicated on the design drawings and shall
be fabricated from fl exible plasticized PVC material (not less
than 3/ 32 inch thick) having corrosion resistance and temperature
compatibility suitable for the environment (Figure 10). Longitudinal
seams shall be sealed by machine fusion welding.
15. DUCT HANGER AND SUPPORTS
All horizontal ducts shall be supported as specifi ed in Figures 17-
19, illustrating acceptable methods of supporting horizontal duct.
Duct shall also be supported independently at other equipment
locations and on both sides of an expansion or fl exible joint.
Hangers and supports shall be securely fastened to the building or
structure. Care shall be taken to avoid creating conditions of
Electric and Pneumatic Actuated Dampers are
available in Fabco’s INSTADUCT® Program
stress on the fi nished material. Hanger materials and hardware
shall be stainless steel or plastisol coated steel for corrosion resistance
as necessary. Otherwise, mild steel or equal may be used.
16. FUME HOODS
Fume hoods will be properly designed and fabricated to suit installation.
FABCO design engineers can assist with this requirement.
17. VOLUME DAMPERS
Volume dampers shall be installed at the locations indicated on
the project drawings for balancing and adjustment of the system.
Acceptable damper construction is illustrated in Figure 9. Volume
dampers shall be constructed of PVC material and provided with
suitable corrosion proof attachments for permanently setting
dampers in a fi xed position after balancing.
18. DRAINS
The drains shall be full sized half couplings, preferably 2” in diameter
and suitable for receiving standard IPS pipe connections.
The fi ttings shall be continuously welded and trimmed fl ush with
the interior surface of the duct.
19. AUXILIARY EQUIPMENT
Fans, scrubbers, fi lters, eliminators, sound traps and other such
auxiliary equipment, can be incorporated into the system.
Your FABCO designer can assist you with these requirements as
well.
20. MAINTENANCE INSTRUCTIONS
A full maintenance procedure/check list for individual exhaust
ventilation, scrubbing and fan components has been developed
and is available on a project- by-project basis from the FABCO
designer.
Note: Figures 1-24 mentioned are illustrations and drawings
from the Technical and Dimensional section of the Instaduct®
program.
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