Napoleon B42NTR Installation And Operating Instructions Manual page 19

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 T
3.5V
T
14.95 FT (4.6m) < 19.25 FT (5.9m)
Formula 2: H + V < 24.75 FT (7.5m)
T T
20.45 FT (6.2m) < 24.75 FT (7.5m)
Since both formulas are met, this vent configuration is acceptable.
(H ) > (V
T
REQUIRED
VERTICAL RISE IN
INCHES
(MILLIMETERS)V
HORIZONTAL VENT RUN PLUS OFFSET IN FEET (METERS) H
= 3.5FT (1.1m) x 5.5FT (1.7m) = 19.25FT (5.9m)
)
T
See graph to determine the required vertical rise V
required horizontal run H
150(3810)
150(3810)
147 (3733.8
147 (3733.8
100 (2540)
100 (2540)
T
66
66
(1676.4)
(1676.4)
50 (1270)
50 (1270)
12
(304.8)
8 (203)
0
2.5 5
0
2.5 5 7.5
(0.8) (1.5) (2.3)
(0.8) (1.5) (2.3)
1 3.5
1 3.5
(0.3) (1.1)
(0.3) (1.1)
The shaded area within the lines represents acceptable
values for H
V
H
1
for the
T
.
T
7.5 10 12.5 15 17.5
10 12.5 15 17.5
(3.1) (3.8) (4.6) (5.3) (6.1)
(3.1) (3.8) (4.6) (5.3) (6.1)
19.25
19.25
(5.9)
(5.9)
and H
T T
90°
H
3
V
2
90°
H
2
90°
1
90°
16.3_2B
W415-1293 / C / 07.28.16
19
EN
20
20
T