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Heat & Glo • Cerona-36, Cerona-42 • 2106-900 Rev. H • 11/0812
A. Vent Termination Minimum Clearances
Fire Risk.
Explosion Risk.
Maintain vent clearance to combustibles as
specifi ed.
• Do not pack air space with insulation or other
materials.
Failure to keep insulation or other materials
away from vent pipe may cause fi re.
Roof Pitch H (Min.) Ft.
Flat to 6/12...........................................................1.0*
Over 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
4
4
Termination Locations
Measure horizontal clearances from this surface.
Measure vertical clearances from this surface.
Figure 4.3 Multiple Vertical Termination
Figure 4.2 specifi es minimum vent heights for various
pitched roofs.
(See Figure 4.4 for specifi c clearances)
* 3 foot minimum in snow regions
HORIZONTAL
OVERHANG
VERTICAL
WALL
GAS DIRECT VENT
TERMINATION CAP
12
X
ROOF PITCH
IS X/ 12
LOWEST
DISCHARGE
OPENING
2 FT.
MIN.
20 INCHES MIN.
H (MIN.) - MINIMUM HEIGHT FROM ROOF
TO LOWEST DISCHARGE OPENING
Gas
Termination
Wood & Fuel Oil
Termination
Comments
A 6 in. 20 in. min. Horizontal distance between terminations
B 20 in. 24 in. min. Distance to perpendicular wall
C 18 in. 18 in. Vertical distance between terminations
C
A
GAS
TERMINATION
B
GAS, WOOD OR FUEL
OIL TERMINATION
WARNING
Fire Risk.
Explosion Risk.
Inspect external vent cap regularly.
• Ensure no debris blocks cap.
• Combustible materials blocking cap may
ignite.
• Restricted air fl ow affects burner operation.
WARNING