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VentInG InStaLLatIon
roof pitch
Flat to 6/12
Over 6/12 to 7/12
Over 7/12 to 8/12
Over 8/12 to 9/12
Over 9/12 to 10/12
Over 10/12 to 11/12
Over 11/12 to 12/12
*H - Minimum height from roof to
lowest discharge opening of vent
Figure 30 -
Minimum Chimney Clearance
Figure 31 -
Roof Flashing
20301763
h (feet)
h (mm)
1.0
305
1.25
381
1.5
457
2.0
610
Storm Collar
2.5
762
3.25
991
4.0
1219
3 #5 Sheet Metal
Screws per Joint
Sealant
Storm Collar
TWL101a
TWL101a
Twist Lock Pipe
2/8/99 djt
Horizontal Overhang
2 ft. (610 mm)
Min.
Termination
Vent
Flashing
1" (25 mm) Minimum
Clearance to Combustibles
Concentric
Vent Pipe
FP1971
Min chimney clearance
DVBL7 Series Gas Fireplace
2 ft.
(610 mm)
Min.
Lowest Dis-
charge Opening
12
H*
X
FP1971
21
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