19
20306747
DVM Series Direct Vent Gas Fireplace
Max 20"
Max 20"
36"
(914 mm)
Max.
36"
(914 mm)
Max.
FP1177
max horizontal run
VENTING INSTALLATION
•
The maximum number of 90° elbows per side wall
installation is three (3).
Figure 20
•
If a 90° elbow is fitted directly on top of the fireplace
flange, the maximum horizontal vent run before the ter
-
mination or a vertical rise is 36" (914 mm).
Figure 21
A: 10’
B: 7’
7’6”
FP1959
max run w/elbows
Figure 22 -
Maximum Vent Run with Elbows
Horizontal 90° Elbow = 3' Reduction
FP1959
A + B = 17' Maximum
FP1176
max 90 bends
Figure 20 -
Maximum Three (3) 90° Elbows
Per Installation
3 x 90°
Elbows
3 x 90°
Elbows
FP1176
Figure 21 -
Maximum Horizontal Run with No Rise
FP1177
• If a 90° elbow is used in the horizontal vent run (level
height maintained) the horizontal vent length is reduced
by 36" (914 mm)
Figure 22.
This does not apply if the
90° elbows are used to increase or redirect a vertical
rise.
Figure 23
Example:
According to the vent graph (
Page 15
) the
maximum horizontal vent length in a system with a 7.5'
vertical rise is 20’ (6 m) and if a 90° elbow is required in the
horizontal vent it must be reduced to 17' (5.2 m).
In Figures 22 and 23,
Dimension A plus B must not be
greater than 17' (5.2 m).
Figure 23 -
Horizontal Run Reduction
A
B
7’6”
90°
FP2413
horz run reduct
FP2413
When installing the appliance as a rear vent unit, the 90°, 45° transition elbow attached directly to the rear of the unit
is NOT INCLUDED in the following criteria and calculations, and unless specifically mentioned should be ignored
when calculating venting layouts.
WARNING
