Heatilator • ADI-ZCFB-S • 2032-910 Rev. i • 6/09
9
Fire Risk.
Asphyxiation Risk.
• Terminations MUST meet minimum clearances.
• Exhaust gases are hot.
• Nearby vents may draw fumes into house.
A. Vent Termination Minimum Clearances
Figure 4.1 specifi es minimum vent heights for various
pitched roofs.
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 Minimum height from roof to lowest discharge
opening
4
Termination Locations
* 3 foot minimum in snow regions
WARNING
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
