Napoleon BGD42CFN Installation And Operating Instructions Manual page 14

14
Simple venting confi guration (only one 45° and 90°
elbow)
For vent confi gurations requiring more than one 45° elbow and 90° elbow, the following formulas
apply:
Formula 1: H
T
Formula 2: H
T
Example:
V = 4 FT
1
V = 1.5 FT
2
V = V + V
T 1 2
H = 2 FT
1
H = 1 FT
2
H = 1 FT
3
H = 1.5 FT
4
H = H + H
R 1 2
H = .03 (one 45° elbow + four 90° elbows - 135°) = .03 (405 - 135°) = 8.1 FT
O
H = H + H
T R O
H + V = 13.6 + 5.5 = 19.1 FT
T T
Formula 1:
Formula 2:
Since both formulas are met, this vent con guration is acceptable.
W415-0779 / D / 08.13.12
< 4.2 V
T
+ V < 24.75 feet
T
= 4 FT + 1.5 FT = 5.5 FT
+ H + H = 2 + 1 + 1 + 1.5 = 5.5 FT
3 4
= 5.5 + 8.1 = 13.6 FT
H < 4.2 V
T T
4.2 V = 4.2 x 5.5 FT = 23.1 FT
T
13.6 < 23.1
H + V < 24.75 FT
T T
19.1 < 24.75
(H ) > (V )
T T
See graph to determine the required vertical
rise V
T
REQUIRED
VERTICAL
RISE IN
INCHES V
The shaded area within the lines represents
acceptable values for H
90°
for the required horizontal run H
150
147"
100
T
57"
50
0
5 10 15
12.5'
HORIZONTAL VENT RUN PLUS
OFFSET IN FEET H
and V
T
90°
90°
H
3
H
1
H
2
90°
V
1
45°
16.5_2
.
T
20
T
T
H
4
V
2