Napoleon Ascent BHD4PN Installation And Operation Manual page 18

venting requirements
EN
Simple venting configuration (only one
45° and 90° elbow)
For vent configurations requiring more than two 90° elbows, the following formulas apply:
Formula 1: H < 4.2V
T T
Formula 2: H + V < 24.75 feet (7.5m)
T T
Example:
= 4 FT (1.2m)
V
1
V = 1.5 FT (0.5m)
2
V = V + V = 4FT (1.2m) + 1.5FT (0.5m) = 5.5 FT (1.7m)
T 1 2
H = 2 FT (0.6m)
1
H = 1 FT (0.3m)
2
= 1 FT (0.3m)
H
3
H = 1.5 FT (0.5m)
4
H = H + H +H +H = 2FT(0.6m) + 1FT(0.3m) + 1FT(0.3m) + 1.5FT(0.5m)
R 1 2 3 4
= 5.5 FT(1.7m)
H = .03 (one 45° elbow + four 90° elbows - 135°)
O
= .03 (405 - 135°) = 8.1 FT (2.5m)
H = H = 5.5 FT (1.7m) + 8.1 FT (2.5m) = 13.6 FT (4.2m)
+ H
T R O
H + V = 13.6 FT (4.2m) + 5.5 FT (1.7m) = 19.1 FT (5.8m)
T T
Formula 1: H < 4.2FT (1.3m) VT
T
4.2FT (1.3m) VT = 4.2 FT (1.3m) x 5.5 FT (1.7m)
13.6 FT (4.2m) < 23.1 FT (7M)
Formula 2: H + V
T T
19.1 FT (5.8m) < 24.75 FT (7.5m)
Since both formulas are met, this vent configuration is acceptable.
18
W415-1285 / G / 04.27.18
= 23.1 FT (7m)
< 24.75 FT (7.5m)
(H ) > (V )
T T
See graph to determine the required vertical rise V
REQUIRED
VERTICAL RISE IN
FEET (METERS)V
T
HORIZONTAL VENT RUN PLUS OFFSET IN FEET (METERS) H
The shaded area within the lines represents acceptable
90°
required horizontal run H .
T
12.3 (3.8)
8.3 (2.5)
4.8 (1.5)
4.2 (1.3)
0
5 10 15 20
(1.5) (3.1) (4.6) (6.1)
12.5
(3.8)
values for H and H
T T
90°
90°
H
3
V
H
2
H
1
2
90°
V
1
45°
13.3_2
for the
T
T
H
4