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LIGHTWEIGHT BLOCK-IN - SPECIFICATIONS (Cont.)
Chase Framed Wall -- Chase Venting
Block
Enclosure
The chase must be vented with a minimum 28 square inch of cross sectional opening duct (6"
diameter round vent is sufficient). Failure to vent the system will create a fire
hazard. This vent helps circulate air into the air space between the chase walls and the
masonry enclosure and provides cooling air for the double-wall chimney. The vent must
terminate within 24" of the chase floor (see illustration above). The maximum length for 6"
diameter round duct is 12' and 25' for 8" duct. The duct can go to an attic or crawl space
providing they are vented. Some building codes may require that the ducts continue through
the attic or crawl space to an outside wall.
Check with the local building department if venting anyplace other than outdoors. This
includes the attic, crawl space, or garage. This type of venting may require a special type of
venting duct such as a venting duct with a fire curtain.
This vent should be installed before starting the block-in procedure to allow for the space
needed to measure and cut the hole for the duct.
24" Maximum
(Measured From
Center of Vent)
Page 10
Chase Wall
Cooling Air Vent
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