Page 15
17333-15-0806
To Use the Vent Graph (Figure 19)
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 6.5
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" (45cm). 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.
Figure 19
Acceptable vertical and horizontal vent run.
(40' maximum vertical and 20' maximum horizontal)
Unacceptable vertical and horizontal vent run.
Venting Graph (Dimensions in Feet)
VERTICAL
DIMENSION
FROM
THE
BOTTOM
OF
THE
UNIT
TO
THE
CENTER
OF
THE
FLUE
OUTLET
WITH
VERTICAL
OR
HORIZONTAL
TERMINATION
CAPS
VENTING FIREPLACE - TOP
