DuraVent Type B Gas Vent - Manual (Page 13)

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system up towards the termination using
DuraVent Type B Gas Vent, connect a Male
adaptor to the last section of the system, as
shown in Figure 23, insuring that the inner
liner of the adaptor fits smoothly inside the
pipe or fitting below it. push the adaptor down
as far as it will go, and tighten the locking bolt
until the connection is snug.
RELINING MASONRY CHIMNEYS
FOR USE WITH GAS
APPLIANCES
1. Description. a masonry chimney should be
relined with B-Vent when venting a category I
gas appliance, such as a gas fireplace insert
or freestanding gas stove, or to improve the
venting and reduce condensation of existing
gas appliances which are currently venting
into the masonry chimney. These instructions
encompass two general configurations: (1)
a gas fireplace situated inside an existing
masonry fireplace (Figure 24) or (2), a
freestanding gas appliance venting into an
existing masonry chimney. (Figure 30)
2. Masonry Inspection. Have the masonry
chimney inspected by a cSIa certified
chimney Sweep or other qualified professional
to determine it’s structural condition. clean
and repair as necessary.
3. Gas Fireplace. carefully read the
appliance manufacturer’s installation
instructions. use the recommended vent size.
Do not reduce the vent size below that of the
flue exit on the appliance. Do not common vent
gas fireplaces.
(a) Measurements. Measure and record the
dimension as shown on Figure 25 (Height “a”).
you will need an additional 15” of vent above
the masonry chimney. It is a good idea to allow
for a little extra height in your measurements.
(b) Pipe and Fitting Requirements. The
bottom 5 foot section of vent will be Flex pipe
Figure 22 Figure 23
(used to get around the smoke shelf, and to
connect to the appliance). The remainder will
be rigid B-Vent pipe Sections. For each pipe
joint, subtract 1-1/2 inches.
(c). Connector. Read the appliance
manufacturer’s instructions for connecting
the Flex pipe to the appliance. In most cases,
a Draft Hood connector will be required as
shown in Figure 26. If you are not sure, contact
EXISTInG
SySTEM
B-VEnT
aDapTER
(FEMaLE)
EXISTInG
SySTEM
B-VEnT
aDapTER
(MaLE)
Figure 24
GAS FIREPLACE
FLEX PIPE
FLASHING
STORM COLLAR
WITH SCREWS