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Heat & Glo • Crescent II • 2083-902 Rev. G • 9/05
9
A. Vent Termination Minimum Clearances
Fire Risk.
Explosion Risk.
Maintain vent clearance to combustibles
as specified.
WARNING
• Do not pack air space with insulation or
other materials.
Failure to keep insulation or other materials
away from vent pipe may cause fire.
Roof Pitch H (Min.) Ft.
Flat to 6/12 ......................................................... 1.0*
6/12 to 7/12 ........................................................ 1.25*
Over 7/12 to 8/12 ............................................... 1.5*
Over 8/12 to 9/12 ............................................... 2.0*
Over 9/12 to 10/12 ............................................. 2.5
Over 10/12 to 11/12 ........................................... 3.25
Over 11/12 to 12/12 ........................................... 4.0
Over 12/12 to 14/12 ........................................... 5.0
Over 14/12 to 16/12 ........................................... 6.0
Over 16/12 to 18/12 ........................................... 7.0
Over 18/12 to 20/12 ........................................... 7.5
Over 20/12 to 21/12 ........................................... 8.0
Figure 4.1
Figure 4.2 Minimum Height from Roof to
Lowest Discharge Opening
Termination Locations
4
Measure horizontal clearances from this surface.
Measure vertical clearances from this surface.
Figure 4.3 Multiple Vertical Termination
Figure 4.2 specifies minimum vent heights for various
pitched roofs.
(See Figure 4.4 for specific clearances)
* 3 foot minimum in snow regions
GAS, WOOD or FUEL
OIL TERMINATION
20 IN.
(MINIMUM) TO
PERPENDICULAR
WALL (GAS ONLY)
18 IN.
A
GAS
TERMINATION
Gas Termination Wood & Fuel Oil Termination
A 6 in. 20 in.
HORIZONTAL
OVERHANG
V
ERTICAL
WALL
TERMINATION
CAP
12
X
ROOF PITCH
IS X/ 12
LOWEST
DISCHARGE
OPENING
H (MIN.) - MINIMUM HEIGHT FROM ROOF
TO LOWEST DISCHARGE OPENING
2 FT.
MIN.
20 INCHES