Troubleshooting guide

13
RELINING MASONRY
CHIMNEYS FOR USE WITH
GAS APPLIANCES
1. Description. A masonry chim-
ney should be relined with B-Vent
when venting a Category I gas appli-
ance, such as a gas fireplace insert
or freestanding gas stove, or to im-
prove the venting and reduce con-
densation of existing gas appliances
which are currently venting into the
masonry chimney. These instruc-
tions encompass two general con-
figurations: (1) A gas fireplace
situated inside an existing masonry
fireplace (Figure 24) or (2), a free-
standing gas appliance venting into an exist-
ing masonry chimney. (Figure 30)
2. Masonry Inspection. Have the ma-
sonry chimney inspected by a qualified chim-
ney sweep or installer to determine it's struc-
tural condition. Clean and repair as neces-
sary.
3. Gas Fireplace. Carefully read the
appliance manufacturer's installation instruc-
tions. 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
12" of vent above the masonry chimney. It is
a good idea to allow for a little extra height
GAS RELINING
ASSEMBLY
B-VENT PIPE
SECTIONS
EXISTING
MASONRY
FIREPLACE
AND
CHIMNEY
FLEX
PIPE
GAS
FIREPLACE
Fig 24
12 INCHES
A
B
C
Fig 25