Napoleon B30NTR-1 Installation And Operation Manual page 18

venting requirements
EN
Simple venting configuration
(only two 90° elbows)
For vent configurations requiring more than two 90° elbows, the following formulas apply:
Formula 1: H < 3.5V
T T
Formula 2: H + V < 24.75 feet (7.5m)
T T
Example:
V = 4 FT (1.2m)
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
H = 1 FT (0.3m)
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) = 5.5 FT(1.7m)
R 1 2 3 4
H = .03 (four 90° elbows + one 45° elbow - 90°)
O
= .03 (90 + 90 + 90 + 90 + 45 - 90) = 9.45 FT (2.9m)
H = H + H = 5.5FT (1.7m) + 9.45FT (2.9m) = 14.95FT (4.6m)
T R O
H + V = 14.95FT (4.6m) + 5.5FT (1.7m) = 20.45FT (6.2m)
T T
Formula 1: H < 3.5V
T
3.5V
14.95 FT (4.6m) < 19.25 FT (5.9m)
Formula 2: H + V
T
20.45 FT (6.2m) < 24.75 FT (7.5m)
Since both formulas are met, this vent configuration is acceptable.
18
W415-1768 / C / 03.08.19
T
= 3.5FT (1.1m) x 5.5FT (1.7m) = 19.25FT (5.9m)
T
< 24.75 FT (7.5m)
T
(H ) > (V )
T T
See graph to determine the required vertical rise V
12.5 (3.8)
12.25 (3.7)
REQUIRED
VERTICAL RISE IN
8.3 (2.54)
FEET
(METERS)V
T
5.5
(1.68)
4.2 (1.3)
1
(0.3)
0
1
(0.3)
HORIZONTAL VENT RUN PLUS OFFSET IN FEET (METERS) H
The shaded area within the lines represents acceptable
required horizontal run H .
T
2.5 5 7.5 10 12.5 15
(0.8) (1.5) (2.3) (3.1) (3.8) (4.6)
3.5
(1.1)
values for H and H
T T
90°
H
3
V
2
90°
H
2
90°
V
1
H
1
90°
for the
T
17.5 20
(5.3) (6.1)
19.25
(5.9)
T