Figure - Napoleon BGD36CFNTR Installation And Operating Instructions Manual
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when (H
) < (V
)
T
T
Simple venting confi guration (only one 45º and 90° elbow)
FIGURE 29
REQUIRED
VERTICAL
RISE IN FEET
(V
)
T
CALCULATED HORIZONTAL VENT RUN PLUS OFF-
SETS IN FEET (H
The shaded area within the lines represents acceptable
values for H
and V
T
BGD42CF HORIZONTAL TERMINATION
90°
45°
)
T
.
T
For vent confi gurations requiring more than one 45º and
90° elbow, the following formulas apply:
Formula 1: HT < VT
Formula 2: HT + VT < 40 feet
Example 1:
90°
FIGURE 30
45°
H
1
V
= 8 ft
1
V
V
= 8 ft
T
1
H
= 2.5 ft
1
H
= 2 ft
2
H
= H
+ H
= 2.5 + 2 = 4.5 ft
R
1
2
H
= .03(one 45° elbows + two 90° elbows - 135°)
O
= .03(225 - 135°) = 2.7 ft
H
= H
+ H
= 4.5 + 2.7 = 7.2 ft
T
R
O
H
+ V
= 7.2 + 8 = 15.2 ft
T
T
Formula 1:
H
< V
T
T
7.2 < 8
Formula 2:
H
+ V
< 40 feet
T
T
15.2 < 40
Since both formulas are met, this vent confi guration is ac-
ceptable.
15
H
2
V
1
W415-0566 / E / 09.28.07
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