10
CENTRAL HEATING DUCT SYSTEM
CLEARANCES
All hot air ductwork must be 8" diameter B-Vent
through the initial wall or ceiling penetration.
Single wall pipe may then be used providing
booster fans and backdraft dampers are installed
on upward ducting.
2" clearance to combustibles must be maintained
around the hot air ductwork.
NOTE:
When ducting down, attach a 90
o
elbow to the top
of “T” connector for installation of room hot air register.
This is essential to dissipate heat in the event of fan failure.
Attach 90
o
elbow to side of “T” to run ducting to
basement or crawl space.
Summary of Contents for AIR-TIGHT
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