41978-2-0321
Page 33
TO USE THE VENT GRAPH
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 fireplace in
accordance with same.
EXAMPLE A:
If the vertical dimension from the floor of the fireplace is 32 feet,
the horizontal run to the outer wall flange must not exceed 5 feet.
EXAMPLE B:
If the vertical dimension from the floor of the fireplace is 24 feet,
the horizontal run to the outer wall flange must not exceed 10 feet.
VENTING FIREPLACE
EXAMPLE C:
If the horizontal run to the outer wall flange is 16 feet, the vertical
dimension from the floor of the fireplace to the center of the
termination must not be less than 7 feet.
SPECIAL NOTE:
For each 45° elbow installed in the horizontal
run, the length of the horizontal run MUST be reduced by 18
inches. Reduce by 3 feet for every 90° elbow. This does not apply if
the 45° elbows are installed on the vertical part of the vent system.
EXAMPLE:
According to the chart the maximum horizontal
vent length is 20 feet and if two 45° elbows are required in the
horizontal vent it must be reduced to 17 feet.
The maximum number of 45° elbows permitted per side wall
installation is two. These elbows can be installed in either the
vertical or horizontal run.
The maximum number of 90° elbows in a vent run is three.
Acceptable vertical and horizontal vent run.
(40 feet maximum vertical and 20 feet maximum horizontal)
Unacceptable vertical and horizontal vent run.
See text above for Examples A, B and C.
Figure 39
VENTING GRAPH (Dimensions in Feet)
A
B
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
TIONS CAPS
C
