Napoleon BGD48N Installation And Operation Instructions Manual page 10
Natural and propan gas fireplaces
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10
DEFINITIONS
for the following symbols used in the venting calculations and
examples are:
> - greater than
> - equal to or greater than
< - less than
< - equal to or less than
H
- total of both horizontal vent lengths (H
T
in feet
H
- combined horizontal vent lengths in feet
R
H
- offset factor: .03(total degrees of offset - 135°*) in
O
feet
V
- combined vertical vent lengths in feet
T
when (H
) < (V
)
T
T
Simple venting confi guration (only one 45º and 90° elbow)
90°
FIGURE 6
REQUIRED
V E R T I C A L
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
T
W415-0326 / C / 11.23.07
) and offsets (H
R
HORIZONTAL TERMINATION
45º
)
T
ELBOW VENT LENGTH VALUES
1°
15°
30°
45°*
90°*
)
O
* the fi rst 45º and 90° offset has a zero value and is shown
in the formula as -45° and -90º respectively or -135º when
combined.
For vent confi gurations requiring more than one 45º and 90° elbow,
the following formulas apply:
Formula 1: H
< V
T
Formula 2: H
+ V
T
Example 1:
FIGURE 7
45º
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 45º elbow + two 90º elbows - 135º)
O
=0.3(225-135º) = 2.7ft
H
= H
+ H
= 4.5 + 2.7 = 7.2 ft
T
R
O
H
+ V
= 7.2 +8 =15.2ft
T
T
Formula 1:
H
< V
T
7.2 < 8
Formula 2:
H
+ V
T
15.2 < 40
Since both formulas are met, this vent confi guration is ac-
ceptable.
feet
inches
0.03
0.5
0.45
6.0
0.9
11.0
1.35
16.0
2.7
32.0
T
< 40 feet
T
90°
H
2
V
1
H
1
90°
T
< 40 feet
T
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