Owner`s manual

26591-1-1209 Page 43
Locate and mark the center point of the venting pipe. Using a nail
on the underside of the roof and drive this nail through this center
point. Make the outline of the roof hole around this center point.
NOTE: Size of the roof hole dimensions depend on the pitch of
the roof. There must be a 1 inch clearance (25mm) to the
vertical pipe sections. This clearance is to all combustible
material.
Cover the opening of the vent pipe and cut and frame the roof hole.
Use framing lumber the same size as the roof rafters and install the
frame securely. Flashing anchored to frame must withstand high
winds. The storm collar is placed over this joint to make a water-
tight seal. Non-hardening sealant should be used to completely seal

Determining Minimum Vent Height Above the Roof.
WARNING: Major U.S. building codes specify minimum
chimney and/or vent height above the roof top. These minimum
-

Figure 59
Note that for steep roof pitches, the vent height must be increased.
In high wind conditions, nearby trees, adjoining roof lines, steep
pitched roofs, and other similar factors can result in poor draft,
or down-drafting. In these cases, increasing the vent height may
solve this problem.
When terminating the vent cap near an exterior wall or overhang,
maintain minimum clearances as shown in Figure 60.
General Maintenance
Conduct an inspection of the venting system semi-annually.
Recommended areas to inspect are as follows:
1. Check areas of the venting system which are exposed to the
elements for corrosion. These will appear as rust spots or
streaks and, in extreme cases, holes. These components should
immediately be replaced.
 
any bird nests or other foreign material.
3. Check for evidence of excessive condensate, such as water
droplets forming in the inner liner and subsequently dripping
out at joints. Condensate can cause corrosion of caps, pipe and

many elbows and exterior portions of the system being exposed
to cold weather.
 
disturbed and, consequently, loosened. Also, check mechanical

Venting terminal shall not be recessed into a wall or siding.
A removable panel or other means must be provided in the enclosure

NOTE: This also pertains to vertical vent systems installed on the
outside of the building.
Slide the vertical vent cap over the ends of the vent pipe and secure.
See Figure 61.
Installing the Vent System in a Chase
A chase is a vertical box-like structure built to enclose the gas

of a building may be, but are not required to be installed inside a
chase.
Figure 61

the chase may vary with the type of building. These instructions
are not substitutes for the requirements of local building
codes. Therefore, your local building codes must be checked
to determine the requirements for these steps.
VENT CAP
GAS VENT
H
LOWEST
DISCHARGE
OPENING
H (Min.)-Minimum height from
roof to lowest discharge opening
ROOF PITCH IS X/12
ROOF PITCH H (Min.)
Flat to 6/12 12" (305 mm)
6/12 to 7/12 15" (381 mm)
Over 7/12 to 8/12 18" (457 mm)
Over 8/12 to 16/12 24" (610 mm)
Over 16/12 to 21/12 36" (914 mm)
VERTICAL TERMINATION
Figure 60