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Heat & Glo • Crescent II • 2083-902 Rev. N • 7/09 11
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 4.2 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
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
Figure 4.3 Staggered Termination Caps
Gas, Wood or Fuel Oil
Termination Cap
B
Gas
Termination
Cap **
A*
*
If using decorative cap cover(s), this distance may need to be
increased. Refer to the installation instructions supplied with the
decorative capcover.
**
In a staggered installation with both gas and wood terminations, the
wood termination cap must be higher than the gas termination cap.
AB
6in.(minimum)upto20in.
152 mm/508 mm
18 in. minimum
457 mm
20 in. and over 0 in. minimum
Î