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Installing the Vent System in a Chase
A chase is a vertical box-like structure built to enclose the gas
appliance 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.
NOTE:
Build the chase large enough to the minimum clearance of
combustible materials (including insulation) to the vent system. When
installing the vent system in a chase, to 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.
Figure 47
Vertical Through the Roof Applications
Your Gas Fireplace has been approved for:
a) Vertical installations up to 40 feet in height.
b) Two sets of 45 degree elbow offsets within these vertical
installations. From 0 to a maximum of 8 ft. a vent pipe can be
used between elbows.
c) Wall straps must be used to support offset pipe every 4’.
This application will require that you first determine the roof pitch
and use the appropriate venting components.
OFFSET CHART
RISE
OFFSET
SIZE
5” X 8”
ELBOW
DEGREES
CHIMNEY
SECTION
OFFSET
INCHES
RISE
INCHES
45°
0”
5-5/8”
15-3/8”
45°
6”
8-7/8”
18-3/8”
45°
9”
10-7/8” 20-5/8”
45°
12”
13”
22-5/8”
45°
24”
21-3/8” 31-1/8”
45°
36”
29-7/8” 39-3/8”
45°
36”
28-7/8” 39-3/8”
45°
48”
38-1/4” 47-7/8”
Figure 48
VERTICAL TERMINATION (continued)
