Napoleon BHD4N - Page 16

W415-1285 / A / 11.03.14
16
EN
16.5_2A
Simple venting confi guration (only one 45° and 90°
elbow)
(H
T
) > (V
T
)
For vent confi gurations requiring more than one 45° elbow and 90° elbow, the following formulas
apply:
Formula 1: H
T
< 4.2 V
T
Formula 2: H
T
+ V
T
< 24.75 feet (7.5m)
Example:
V
1
= 4 FT (1.2m)
V
2
= 1.5 FT (0.5m)
V
T
= V
1
+ V
2
= 4 FT (1.2m) + 1.5 FT (0.5m) = 5.5 FT (1.7m)
H
1
= 2 FT (0.6m)
H
2
= 1 FT (0.3m)
H
3
= 1 FT (0.3m)
H
4
= 1.5 FT (0.5m)
H
R
= H
1
+ H
2
+ H
3
+ H
4
= 2FT (0.6m) + 1FT (0.3m) + 1FT (0.3m) + 1.5FT (0.5m) = 5.5 FT (1.7m)
H
O
= .03 (one 45° elbow + four 90° elbows - 135°) = .03 (405 - 135°) = 8.1 FT (2.5m)
H
T
= H
R
+ H
O
= 5.5 FT (1.7m) + 8.1 FT (2.5m) = 13.6 FT (4.2m)
H
T
+ V
T
= 13.6 FT (4.2m) + 5.5 FT (1.7m) = 19.1 FT (5.8m)
Formula 1: H
T
< 4.2FT (1.3m) V
T
4.2FT (1.3m) V
T
= 4.2 FT (1.3m) x 5.5 FT (1.7m)= 23.1 FT (7m)
13.6 FT (4.2m) < 23.1 FT (7M)
Formula 2: H
T
+ V
T
< 24.75 FT (7.5m)
19.1 FT (5.8m) < 24.75 FT (7.5m)
Since both formulas are met, this vent confi guration is acceptable.
90°
90°
45°
V
1
H
1
H
4
90°
90°
H
3
H
2
V
2
REQUIRED
VERTICAL RISE
IN INCHES
(MILLIMETERS) V
T
0
5
(1.5)
15
(4.6)
20
(6.1)
100 (2540)
50 (1270)
150 (3810)
12.5
(3.8)
57 (1447.8)
147 (3733.8)
10
(3.1)
HORIZONTAL VENT RUN PLUS
OFFSET IN FEET
(
METERS
)
H
T
See graph to determine the required vertical
rise V
T
for the required horizontal run H
T
.
The shaded area within the lines represents acceptable values for H
T
and V
T