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39357-0-1018
Page 27
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 this
flashing installation.
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 heights are
necessary in the interest of safety. These specifications are
summarized in Figure 38.
H
X
12
VENT CAP
GAS VENT
LOWEST
DISCHARGE
OPENING
ROOF PITCH IS X/12
H (Min.) - Minimum height from
roof to lowest discharge opening
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)
Figure 38
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.
Figure 39
When terminating the vent cap near an exterior wall or overhang,
maintain minimum clearances as shown in
Figure 39.
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 inner liner and subsequently dripping
out at joints. Condensate can cause corrosion of caps, pipe and
fittings. It may be caused by having excessive lateral runs, too
many elbows and exterior portions of the system being exposed
to cold weather.
4. Inspect joints to verify that no pipe sections or fittings have been
disturbed and, consequently, loosened. Also, check mechanical
supports, such as wall straps or plumbers’ tape for rigidity.
Venting terminal shall not be recessed into a wall or siding.
A removable panel or other means must be provided in the enclosure
for visual inspection of the flue connection.
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 40.
VERTICAL TERMINATION
Summary of Contents for MILLIVOLT STANDING PILOT DVX36FP31L-4
Page 52: ...39357 0 1018 Page 52 LOG PLACEMENT 12 Place Log I on the two left pins of Log B as shown below...
Page 54: ...39357 0 1018 Page 54 LOG PLACEMENT 14 Place Log K on far right pin of Log B as shown below...
Page 57: ...39357 0 1018 Page 57 LOG PLACEMENT 17 The log assembly is now complete...