30369-4-1013
Page 16
To Use the Vent Graph (Figure 17)
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 35 feet,
the horizontal run to the outer wall flange must not exceed
6.5 feet.
EXAMpLE B:
If the vertical dimension from the floor of the unit is
6.8 feet, the horizontal run to the outer wall flange must not
exceed 14.5 feet.
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:
On vertical venting the first elbow does not get
counted.
Acceptable vertical and horizontal vent run.
(40' maximum vertical and 20' maximum horizontal)
Unacceptable vertical and horizontal vent run.
Figure 17
Venting Graph (Dimensions in Feet)
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
B
A
TOP EXIT- VERTICAL AND HORIZONTAL TERMINATION
(DIMENSIONS IN FEET)
VER
TICAL
DIMENSION FROM
THE BOTT
OM OF
THE UNIT
T
O
THE CENTER OF
THE FLUE OUTLET
WITH VER
TICAL
OR HORIZONT
AL
TERMINA
TION CAPS
MINIMUM HEIGHT
FOR 90° ELBOW
CONNECTION
HORIZONTAL RUN
BOTTOM OF FIREPLACE
vENTING FIREpLACE - TOp
