Page 12
19400-3-0406
Vent Runs
In planning the installation for the fireplace, it is necessary to install
certain components before the appliance is completely positioned
and installed. These include the vent system, gas piping for the
appliance, Fresh Air Kit, and the electrical wiring. (The fan option
is available for louvered models only. Electric ignition models will
require electrical service to junction box).
The appliance can be mounted on any of the following surfaces:
1. A flat, hard combustible (burnable) surface.
2. A raised wooden platform.
3. Four (4) corner supports. (Example: Four (4) concrete masonry
blocks.) These supports must be positioned so they contact all
four (4) perimeter edges on the bottom of the unit.
Locate and mark the center point of the vent pipe using a nail on
the underside of the roof. Drive the nail through the center point.
Mark 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 Figures 14 and 15
.
Figure 13
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. 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.
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.
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.
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.
WARNING! This appliance must not be connected to a
chimney flue servicing a separate solid fuel or gas fuel
burning appliance.
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)
VENTING
