VENTING FIREPLACE - REAR
To Use the Vent Graph (Figure 29)
Venting Graph (Dimensions in Feet)
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, the horizontal run to the outer wall flange must not exceed 12.3 feet.
EXAMPLE B:
If the vertical dimension from the floor of the unit is 6 feet, the horizontal run to the outer wall flange must not exceed 6.5 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.
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THEUNIT | CAPS |
VERTICALDIMENSIONFROMTHEBOTTOMOF | TOTHECENTEROFTHEFLUEOUTLET WITHVERTICALORHORIZONTALTERMINATION |
A
B
Figure 29
Acceptable vertical and horizontal vent run. Unacceptable vertical and horizontal vent run.
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