Napoleon BGD36PTR Installation And Operation Instructions Manual page 10
Direct vent millivolt system natural and propane gas model
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10
TOP EXIT / HORIZONTAL TERMINATION
when (H
) > (V
)
T
T
Simple venting configuration (only one 90° elbow)
FIGURE 8
See graph to determine the required ver-
tical rise V
for the required horizontal run
T
H
.
T
REQUIRED
VERTICAL
RISE IN
INCHES
V
HORIZONTAL VENT RUN PLUS OFFSET IN FEET
The shaded area within the lines represents acceptable
values for H
and V
T
T
For vent configurations requiring more than one 90° elbow
the following formulas apply:
Formula 1: H
< 4.2 V
T
Formula 2: H
+ V
< 24.75 feet
T
T
Example 2:
V
= V
= 6 ft
1
T
H
= 3 ft
1
H
= 5 ft
2
H
= H
+ H
= 3 + 5 = 8 ft
R
1
2
H
= .03(two 90° elbows - 90°) = .03(180° - 90°) = 2.7 ft
O
H
= H
+ H
= 8 + 2.7 = 10.7 ft
T
R
O
H
+ V
= 10.7 + 6 =16.7
T
T
H
< 4.2 V
Formula 1:
T
4.2 V
10.7 < 25.2
H
+ V
Formula 2:
T
16.7 < 24.75
Since both formulas are met, this vent configuration is ac-
ceptable.
W415-0210 / E / 06.25.03
.
T
FIGURE 9
T
= 4.2 x 6 = 25.2 ft
T
< 24.75 feet
T
Example 3:
V
= 4 ft
1
V
= 1.5 ft
2
V
= V
+ V
= 4 + 1.5 = 5.5 ft
T
1
2
H
= 2 ft
1
H
= 1 ft
2
H
= 1 ft
3
H
= 1.5 ft
4
H
= H
+ H
+ H
+ H
R
1
2
3
H
= .03(four 90° elbows - 90°) = .03(360° - 90°) = 8.1 ft
O
H
= H
+ H
= 5.5 + 8.1 = 13.6 ft
T
R
O
H
+ V
= 13.6 + 5.5 = 19.1 ft
T
T
Formula 1: H
< 4.2 V
T
4.2 V
13.6 < 23.1
Formula 2: H
+ V
< 24.75 feet
T
T
19.1 < 24.75
Since both formulas are met, this vent configuration is ac-
ceptable.
FIGURE 10
= 2 + 1 + 1 + 1. 5 = 5.5 ft
4
T
= 4.2 x 5.5 = 23.1 ft
T
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