31
*
Appr
ox
.
49
-3
/4
” (
12
66
m
m
) w
it
h
1
2”
v
en
t p
ip
e
40”
(1016 mm) t
o underside of c
ombustible ca
vit
y
Min 1”
(25.4 mm)
Required
clearance
to vertical
pipe affects
cavity depth
12” pipe section
A
p
p
ro
x.
3
9-
1/
4”
(9
97
m
m
)
Stand-off
Fireplace -
Left Side View
40”
(1016 mm) t
o underside of c
ombustible ca
vit
y
1/2”
(13 mm)
beyond
stand-off
A
p
p
ro
x.
3
1”
(787 mm)
*
A
p
p
ro
x.
4
2-
1/
4”
(1073 mm)
*
A
p
p
ro
x.
5
2-
3/
4”
(1
34
0 m
m
) w
it
h
1
2”
v
en
t p
ip
e
Fireplace -
Left side view
12” pipe section
Venting Considerations—Vertical Takeoff
Venting Considerations—Horizontal Takeoff
*
Notes—ALL venting considerations
• Dimensions of venting are based on
using Dura-Vent elbows. Elbow curve
radius dimensions will vary when using
other brands. In general, other brands
have slightly bigger radius.
• 3 inches clearance to combustibles
required above horizontal pipe. Slope
horizontal pipe upwards 1/4 inch per foot.
1 inch clearance required around sides
and bottom of horizontal pipe and around
vertical pipe.
• When calculating effective pipe lengths
subtract approximately 1-1/2 inch for
pipe joint - for example, a 12 inches pipe
section will add approximately 10-1/2
inches overall.
Framing Requirements
QUALIFIED
INSTALLER