Napoleon BHD4N - Horizontal Termination

W415-1285 / A / 11.03.14
15
EN
3.8 HORIZONTAL TERMINATION
16.5A
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
< V
T
Formula 2: H
T
+ V
T
< 40 feet (12.2m)
Example:
V
1
= 8 FT (2.4m)
V
T
= V
1
= 8 FT (2.4m)
H
1
= 2.5 FT (0.8m)
H
2
= 2 FT (0.6m)
H
R
= H
1
+ H
2
= 2.5 FT (0.8m) + 2 FT (0.6m) = 4.5 FT (1.4m)
H
O
= .03 (one 45° elbow + two 90° elbows - 135°) = .03 (225 - 135°) = 2.7 FT (0.8m)
H
T
= H
R
+ H
O
= 4.5 FT (1.4m) + 2.7 FT (0.8m) = 7.2 FT (2.2m)
H
T
+ V
T
= 7.2 FT (2.2m) + 8 FT (2.4m) = 15.2 FT (4.6m)
Formula 1: H
T
< V
T
7.2 FT (2.2m) < 8 FT (2.4m)
Formula 2: H
T
+ V
T
< 40 FT (12.2m)
15.2 FT (4.6m) < 40 FT (12.2m)
Since both formulas are met, this vent confi guration is acceptable.
90°
90°
45°
V
1
H
1
H
2
0
2.5
(0.8)
5
(1.5)
7.5
(2.3)
10
(3.1)
12.5
(3.8)
15
(4.6)
40 (12.2)
10 (3.1)
20 (6.1)
30 (9.1)
17.5
(5.3)
20
(6.1)
39 (11.9)
REQUIRED
VERTICAL
RISE IN FEET
(METERS) V
T
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