41978-1-1220
Page 38
VERTICAL TERMINATION
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.
NOTICE:
Size of the roof hole dimensions depend on the pitch of
the roof. There must be a 1 inch (25 mm) clearance 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 52.
VENT CAP
GAS VENT
24”
24”
MORE
THAN
10 FEET
Figure 52
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.
INSTALLING THE VENT SYSTEM IN A CHASE
A chase is a vertical box-like structure built to enclose the
gas fireplace and/or its 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.
Check local building codes to determine the requirements
for these steps.
NOTICE:
Build the chase large enough to maintain the minimum
clearance of combustible materials (including insulation) to the vent
system. When installing the vent system in a chase, insulate the
chase as you would the outside walls of your home. This is especially
important in cold climates. Upon completion of chase framing, install
the vent system by following the instructions in this manual.
The vertical termination cap for this fireplace must not be any
closer than 24-in. to combustible materials.
See Figure 53.
40’
(12.19M)
MAX
24” MINIMUM
CLEARANCE TO
COMBUSTIBLES
NATURAL OR
MAN MADE
8’ (2.44M)
MAX
8’ (2.44M)
MAX
45°
45°
Figure 53
If two vertical terminations are run near each other, they may be
placed a minimum of 12 inches between them if they are at the
same height.
See Figure 54.
If two vent terminations are not at
the same height, they must be positioned at least 24 inches apart
to minimize draft issues between them.
12”
MINIMUM
Figure 54
40’
(12.19M)
MAX
24” MINIMUM
CLEARANCE TO
COMBUSTIBLES
NATURAL OR
MAN MADE
8’ (2.44M)
MAX
8’ (2.44M)
MAX
45°
45°
VENT CAP
GAS VENT
MORE
THAN
10 FEET