Napoleon BGD48N Installation And Operation Instructions Manual page 12
Natural and propan gas fireplaces
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12
when (H
) < (V
)
T
T
Simple venting confi gurations
FIGURE 10
See graph to determine the required vertical rise V
horizontal run H
.
T
REQUIRED VERTICAL RISE
IN FEET (V
)
T
The shaded area within the lines represents acceptable values
for H
and V
.
T
T
For vent confi gurations requiring more than one 45º and one 90°
elbow , the following formulas apply:
Formula 1: H
< V
T
T
Formula 2: H
+ V
T
T
W415-0326 / C / 11.23.07
VERTICAL TERMINATION
45°
for the required
T
HORIZONTAL VENT RUN PLUS
OFFSETS IN FEET (H
T
< 40 feet
Example 3:
FIGURE 11
45°
V
= 5 ft
1
V
= 10 ft
2
V
= V
T
1
H
= 3 ft
1
H
= 2.5 ft
2
H
= H
R
1
H
= .03 (one 45º elbow + three 90º elbows - 135º)
O
= .03(45+90+90+90-135)=5.4
H
= H
T
R
H
+ V
= 10.9 + 15 = 25.9 ft
T
T
Formula 1:
Formula 2:
Since both formulas are met, this vent confi guration is ac-
ceptable.
)
90°
H
2
V
1
90°
H
1
+ V
= 5 + 10 = 15 ft
2
+ H
= 3 + 2.5 = 5.5 ft
2
+ H
= 5.5 + 5.4 = 10.9 ft
O
H
< V
T
T
10.9 < 15
H
+ V
< 40 feet
T
T
25.9 < 40
V
2
90°
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