M&G DuraVent Combustion Air Systems - Manual (Page 9)

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desired length, secure the two halves with
(3) 3/8” screws provided. If an offset in the
connector pipe is needed, CAS 45-degree
and 90-degree elbows are available. Elbows
cannot be combined to create a bend more
than 90-degrees.
Step 4. Attach Elbow Section to Adapter. The
Elbow Section to connected to the branch
of the Adapter to facilitate the airflow to the
appliance (Fig 8). Slide the Elbow Section onto
the Adapter and secure with (3) 3/8” screws
provided. Connect one end of the flex to the
Elbow Section by sliding a supplied hose
clamp onto the Elbow section, and then slide
the flex over the end of the Elbow Section.
Secure the flex in place by tightening the hose
clamp.
Step 5. Connect to air-inlet of the stove.
Connect the other end of the flex to the air-inlet
of the stove. If the flex slides over the stove
inlet, then attach using a hose clamp provided
(Fig 8). If the stove’s air-inlet is of a different
size, then a Flex Adapter is needed (Fig 9).
The Flex Adapter will attach directly to the
stove over the top of the air inlet, using (4)
3/8” screws provided. The flex will then slide
over the Flex Adapter and is secured with a
hose clamp. A Reducer Flex Adapter is also
available for stoves with a 2” diameter air inlet.
One end of the Reducer Flex Adapter slides
into the flex and is secured with a hose clamp,
the other end slides into the stove inlet and is
secured with (3) 3/8” screws. As an option, a
non-hardening sealant can be used to seal the
connection between the stove and the Flex
Adapter but choose a sealant that can handle
the temperature of the stove.
Step 6. Install the first DuraTech Chimney
Pipe section into the Ceiling Support. Install
chimney sections into the CAS Ceiling Support
as normally directed in the full DuraTech
Installation Instructions. You should install
enough chimney to reach at least a few inches
above the CAS Ceiling Support. The remainder
of the chimney pipe will be installed later.
Step 7. Install Collar above CAS Ceiling
Support. At the top of the CAS Ceiling Support,
install the Collar around the first chimney
section. The Collar prevents debris from falling
into the Ceiling Support, while also allowing
intake air to enter the CAS system. The Collar
should rest on top of the Ceiling Support (Fig
10). The air enters into the Ceilng Support
underneath the Collar. Important: Do not seal
the openings between the Collar and the
Ceiling Support; this is how the stove gets its
air for combustion with the CAS system.
Note: In order for the CAS system to
work, the attic space must have direct access
to outside air (through gable vents, soffit
vents, ventilated flashing, etc.). Combustion
air for the appliance comes into attic through
attic vents or through chimney flashing, and
continues through the CAS system to the
stove.
Step 8. Continue to install remainder of the
chimney system according to the complete
DuraTech installation instructions; L150
DuraTech Installation Instructions.