Heatilator • CNXT Series • 4000-011 Rev N • 11/05
9
Horizontal
overhang
12
X
20 in.
(508 mm)
Lowest
Discharge
Opening
Termination
Cap
Roof Pitch
is X / 12
Vertical
wall
H (min.) - Minimum height
from roof to lowest
discharge opening.
24 in. min.
(610 mm)
Roof Pitch
H (Min.) Ft.
Roof Pitch
H (Min.) Ft.
Flat to 6/12
1.0*
Over 11/12 to 12/12
4.0
Over 6/12 to 7/12
1.25*
Over 12/12 to 14/12
5.0
Over 7/12 to 8/12
1.5*
Over 14/12 to 16/12
6.0
Over 8/12 to 9/12
2.0*
Over 16/12 to 18/12
7.0
Over 9/12 to 10/12
2.5
Over 18/12 to 20/12
7.5
Over 10/12 to 11/12
3.25
Over 20/12 to 21/12
8.0
* 3 ft. minimum in snow regions
Storm Collar
Roof
Flashing
A. Vent Termination Minimum Clearances
Fire Risk
Explosion Risk
• Do not pack air space with insulation or
other materials.
Maintain vent clearance to combustibles as
specifi ed.
WARNING
Failure to keep insulation or other materials
away from vent pipe may cause fi re.
Measure horizontal clearances from this surface.
Measure vertical clearances from this surface
Figure 4.1
Clearances from Cap Surfaces
Figure 4.2
Minimum Height from Roof to Lowest Discharge Opening
(see Figure 4.4 for specifi c clearances)
Gas
Termination
Wood & Fuel Oil Termination
A
6 in.
(152 mm)
20 in.
(508 mm)
Gas, Wood or Fuel
Oil Termination
20 in.
(508 mm)
(minimum) to
Perpendicular
Wall
(gas only)
18 in.
(457 mm)
A
Gas
Termination
Figure 4.3
Multiple Vertical Termination
Figure 4.2 specifi es minimum vent heights for various
pitched roofs.
4
4
Termination Locations
