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Clearance to Combustibles
Appliances
Top ........................................................... 0" (0mm)
Bottom ...................................................... 0" (0mm)
Side .......................................................... 0" (0mm)
Back ......................................................... 0" (0mm)
Perpendicular Sidewall ............................ 0" (0mm)
Top of unit to ceiling ........................... 36" (914mm)
Front of unit to combustibles .............. 36" (914mm)
Venting
B-Vent .................................................... 1" (25mm)
Mantels
The height that a combustible mantel is fitted above the
fireplace is dependent on the depth of the mantel. This
also applies to the distance between the mantel leg (if
fitted) and the fireplace.
For the correct mounting height and widths refer to
Figures 2a and 2b.
Noncombustible mantels and legs may be installed at
any height and width around the appliance.
When using paint or lacquer to finish the
mantel, such paint or lacquer must be heat
resistant to prevent discoloration.
V
W
X
Y
Z
A
B
C
D
E
Ref.
Mantel
Shelf Depth
CFM146
V
14" (356 mm)
DV Mantel Chart
7/5/01 sta
W
12" (305 mm)
X
10" (254 mm)
Y
8" (203 mm)
Z
1¹⁄₂" (38 mm)
Fig. 2a Combustible mantel minimum installation.
7412955
Drywall
Header
Standoff
Maintain minimum 1/2"
(13 mm) clearance to
combustible
Top of Combustion
Chamber
CFM146a
Ref.
Mantel From Top
of Comb. Chamber
A
25" (635 mm)
B
23" (584 mm)
C
21" (533 mm)
D
19" (483 mm)
E
15" (381 mm)
GBR Series B-Vent Gas Fireplace
Black
Surround
Face
Mantel
Leg
CFM164
Side of
Combustion Chamber
CFM164a
Mantel Leg Chart
06/22/01 sta
Ref.
Mantel
Leg Depth
CFM170
F
14" (356 mm)
DV Builder Front
G
12" (305 mm)
View
H
10" (254 mm)
I
8" (203 mm)
J
1¹⁄₂" (38 mm)
Fig. 2b Combustible mantel leg minimum installation.
Hearth Extension
A hearth extension in front of appliance is recommend-
ed but not required.
Insulating for Cold Climates
When an appliance is installed in a chase or an outside
wall, the enclosure should be insulated like any other
wall of the home. Insulation should be installed under
the appliance and on the inside of the exterior walls.
In a chase, it is a good idea to install a firestop at the
first ceiling level above the appliance. Also, install insu-
lation on the side walls. Insulation may then be placed
above the ceiling to assure the space around the appli-
ance is protected. Refer to Page 7, Figure 4.
J
I
H
G
K
L
M
N
O
CFM170
Ref.
Mantel Leg From
of Comb. Opening
K
14" (356 mm)
L
12" (305 mm)
M
10" (254 mm)
N
8" (203 mm)
O
1¹⁄₂" (38 mm)
F
5
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