M&G DuraVent Combustion Air Systems - Manual (Page 7)

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the underside of the roof. In this type of
installation, the combustion air is drawn in
through the flashing, underneath the Storm
Collar (Fig 5).
Step 3. Install CAS Connector Pipe. After
the CAS Ceiling Support is installed and the
stove is located, the CAS Connector Pipe
can be installed. If the stove is a top-exit
stove, then the female end (with pre-punched
holes) of the CAS Adapter goes directly onto
the stove’s outlet collar, with the air intake
branch of the Adapter facing to the back of
the stove (Fig 6). Secure the female end of
the Adapter to the stove’s collar with (3) 1-1/4”
screws provided. Pre-drill the stove’s collar for
the screws, as needed. The CAS Triple-Wall
Stovepipe must have 6" clearance from walls
and combustibles (running vertically) and 8"
clearance from ceilings and combustibles
(running horizontally).
If the stove has a rear outlet, a CAS
Tee is required with the branch connecting
directly to the stove’s outlet. Secure the CAS
Tee to the stove outlet with the (3) 1-1/4”
screws provided. Pre-drill holes in the stove
outlet, as needed. The CAS Adapter can be
installed immediately above or below the CAS
Tee (Fig 6) with screws provided. If installed
below the Tee, remove the Tee Cap from the
Tee and reattach the Tee Cap to the bottom
Figure 5
AIR ENTERS UNDER
THE STORM COLLAR
THROUGH THE
FLASHING FOR ATTIC
CHASE INSTALLATIONS
SqUARE
PORTION
OF CEILING
SUPPORT
MUST BE
AT LEAST
3" BELOW
FINISHED
CEILING
Figure 6
SECURE CAS ADAPTER TO
STOVE WITH SCREWS PROVIDED.
BRANCH SHOULD FACE TOWARDS
BACK OF STOVE.
CAS ADAPTER CAN BE
INSTALLED ABOVE OR BELOW
TEE, BUT SHOULD BE CLOSE
TO AIR INLET OF STOVE
ATTACH TEE CAP TO
BOTTOM OF TEE OR
ADAPTER
SECURE CAS TEE TO BACK
OF STOVE WITH SCREWS
PROVIDED.
Figure 7
CONNECT CAS STOVE
PIPE BY SLIPPING
FEMAILE END OVER
MALE END AND
SECURING WITH
SCREWS PROVIDED
MALE END
FEMALE END