Venting Fireplace-Rear Vent - White Mountain Hearth 1 Installation Instructions And Owner's Manual

To Use the Vent Graph (Figure 30)
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, 4 inches the horizontal run to the outer
wall flange must not exceed 12 feet, 3 inches.
EXAMPLE B:
If the vertical dimension from the floor of the unit
is 6 feet, 9 inches, the horizontal run to the outer
wall flange must not exceed 6 feet, 6 inches.
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: When rear venting unit, adjust air shutter
from 1/16" open up to between 1/8" and 3/16"
for NAT gas.
Adjust air shutter from 1/4" open to between
5/16" and to 3/8" for LP gas.
Page 22
VENTING FIREPLACE - REAR
DVD48FP(ONLY)
REAR HORIZONTAL
VENT CONNECTION
Venting Graph (Dimensions in Feet)
REAR EXIT - VERTICAL AND HORIZONTAL TERMINATION
(DIMENSIONS IN FEET)
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
Acceptable vertical and horizontal vent run.
Unacceptable vertical and horizontal vent run.
Note: When rear venting unit, adjust air shutter from 1/16" open
up to between 1/8" and 3/16" for NAT gas.
Adjust air shutter from 1/4" open to between 5/16" and 3/8" for
LP gas.
A
B
HORIZONTAL RUN
Figure 30
23552-4-0408