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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 mini-
mum heights are necessary in the interest of safety. These
specifications are summarized in Figure 40.
Figure 40
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.
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. Continue 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 top SD-991 for DVS-30 or SD-1291 for DVS-
36/42 over the ends of the vent pipe and secure. (See Figure 41)
Installing the Vent System in a Chase
A chase is a vertical box like structure built to enclose the gas
appliance and/or it's vent system. Vertical vent runs on the outside
of a building may be, but are not required to be installed inside a
chase.
Figure 41
CAUTION: Treatment of firestop spacers and construction
of 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.
NOTE: When installing this vent system in a chase, it is always
good building practice to insulate the chase as you would the
outside walls of your home. This is especially important for cold
climate installations. Upon completion of building your chase
framing, install the vent system by following the instructions in
this manual. Remember to build the chase large enough so that
minimum clearance of combustible materials (including
insulation) to the vent system are maintained.
VERTICAL TERMINATION (For All Models)
