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Determining Minimum Vent Height Above the Roof.
NOTICE: Major U.S. building codes specify minimum chimney
height above the roof top. These specifications are summarized
in Figure 8.
VENT CAP
WOOD BURNING
CHIMNEY
rooF pitcH
Flat to 6/12
6/12 to 7/12
Over 7/12 to 8/12
Over 8/12 to 16/12
Over 16/12 to 21/12
NOTICE: Increase the vent height for steep roof pitches. 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 9.
C L
24"
61CM
MIN.
24"
61CM
MIN.
Page 16
vertical terMination
LOWEST
DISCHARGE
OPENING
ROOF PITCH X/12
H (Min.) Minimum height from
roof to lowest discharge opening
H (Min.) (in inches)
12
15
18
24
36
Figure 8
12"
30.5CM
MIN.
Figure 9
vertical applications
The Gas Fireplace Insert has been approved for vertical
installations up to 40 feet in height (starting of collars to end
of vent pipe).
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.
2. Remove the cap and shine a flashlight down the vent.
Remove any bird nests or other foreign material.
3. Check for evidence of excessive condensate, such as water
droplets forming in the flex venting and subsequently dripping
out at joints or seams. Condensate can cause corrosion of
caps, pipe and fittings. It may be caused by having excessive
runs, or having exterior portions of the system exposed to
cold weather.
4. Inspect joints to verify that no pipe sections or fittings
have been disturbed and, consequently, loosened. Check
mechanical supports.
38102-4-0319
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