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VERTICAL TERMINATION
Determining Minimum Vent Height Above the Roof.
WARNING
Major U.S. building codes specify minimum chimney height
above the roof top. These specifications are summarized in
Figure 11.
VENT CAP
WOOD BURNING
CHIMNEY
LOWEST
DISCHARGE
OPENING
ROOF PITCH X/12
H (Min.) Minimum height from
roof to lowest discharge opening
ROOF PITCH
H (Min.)
(in inches)
Flat to 6/12
12
6/12 to 7/12
15
Over 7/12 to 8/12
18
Over 8/12 to 16/12
24
Over 16/12 to 21/12
36
Figure 11
NOTICE:
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 12.
Figure 12
Vertical Applications
The Gas Fireplace Insert has been approved for vertical
installations up to 35 feet in height (top of insert to cap).
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.
Tall Vent Heights
Poor combustion may occur during initial and cold start-ups.
Open the flue baffle vent to improve performance. To adjust,
rotate the flue baffle vent enough to encourage better draft for
improved combustion.
FIREBOX
BAFFLE
FLUE
BAFFLE
VENT
Figure 13
