Table of Contents
Advertisement
To Use the vent Graph (Figure 29)
1. Determine the height of the center of the horizontal vent pipe.
Using this dimension on the Sidewall Vent Graph, locate the
point it intersects with the slanted graph line.
2. From the point of this intersection, draw a vertical line to the
bottom of the graph.
3. Select the indicated dimension, and position the unit in accordance
with same.
EXAMPlE A:
If the vertical dimension from the floor of the unit is 12 feet, 4 inches,
the horizontal run to the outer wall flange must not exceed 12 feet,
3 inches.
EXAMPlE B:
If the vertical dimension from the floor of the unit is 6 feet, 9 inches
the horizontal run to the outer wall flange must not exceed 6 feet,
6 inches.
SPECIAl NOTE: For each 45 degree elbow installed in the
horizontal run, the length of the horizontal run MUST be reduced
by 18" (457 mm). This does not apply if the 45 degree elbows are
installed on the vertical part of the vent system. Reduce 3' for every
90° elbow.
Example: According to the chart the maximum horizontal vent length
is 20' and if two 45 degree elbows are required in the horizontal
vent it must be reduced to 17'.
The maximum number of 45 degree elbows permitted per side wall
installation is two (2). These elbows can be installed in either the
vertical or horizontal run.
NOTE: When rear venting unit, adjust air shutter from 1/16" open
up to between 1/8" and 3/16" for natural Gas.
Adjust air shutter from 1/4" open to between 5/16" and 3/8" for
Propane Gas.
Page 18
vENTING FIREPlACE - REAR
REAR HORIZONTAL
VENT CONNECTION
Venting Graph (Dimensions in Feet)
REAR EXIT - VERTICAL AND HORIZONTAL TERMINATION
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
Acceptable vertical and horizontal vent run.
Unacceptable vertical and horizontal vent run.
NOTE: When rear venting unit, adjust air shutter from 1/16"
open to between 1/8" and 3/16" for natural Gas.
Adjust air shutter from 1/4" open to between 5/16" and
3/8" for Propane Gas.
(DIMENSIONS IN FEET)
A
B
HORIZONTAL RUN
Figure 29
38717-2-0719
Advertisement
Table of Contents
