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To Use the Vent Graph (Figure 22)
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: (Top Vent Connections with Vertical
Termination).
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: (Top Vent Connections with Vertical
Termination)
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'.
Note: The maximum number of 90 degree elbows permitted
per rear vent take-off is two. Both elbows must be installed
in the vertical orientation.
NOTICE: On vertical venting the first elbow is not counted.
Page 20
VENTING FIREPLACE - TOP
TOP VENT CONNECTION
OF VENTING WITH
HORIZONTAL TERMINATION
Venting Graph (Dimensions in Feet)
TOP EXIT - VERTICAL AND HORIZONTAL TERMINATION
NOTE: FLEX VENT
MAXIMUM HEIGHT
IS 35 FEET
TOP VENT
CONNECTION
Acceptable vertical and horizontal vent run.
Rigid Venting - 40' maximum vertical and 20' maximum
horizontal
Flex Venting - 35' maximum vertical and 20' maximum
horizontal
Unacceptable vertical and horizontal vent run.
(DIMENSIONS IN FEET)
HORIZONTAL RUN
Figure 22
38714-5-0920
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