Napoleon High Definition 81 Series Installation And Operation Manual page 16

venting
EN
Simple venting configurations.
For vent configurations requiring more than two 90° elbows the following formulas apply:
Formula 1: H < 3V
T T
Formula 2: H + V < 40 feet (12.2m)
T T
Example:
V = 2 ft (0.6m)
1
V = 1 ft (0.3m)
2
V = 1.5 ft (0.5m)
3
V = V +V +V = 2 ft (0.6m) + 1 ft (0.3m) + 1.5 ft (0.5m) = 4.5 ft (1.4m)
T 1 2 3
H = 6 ft (1.8m)
1
H = 2 ft (0.6m)
2
H = H + H = 6 ft (1.8m) + 2 ft (0.6m) = 8 ft (2.4m)
R 1 2
H = .03 (four 90° elbows - 90°)
O
= .03 (360° - 90°) = 8.1 ft (2.5m)
H = H + H = 8 ft (2.4m) + 8.1 ft (2.5m) = 16.1 ft (4.9m)
T R O
H + V = 16.1ft (4.9m) + 4.5 ft (1.4m) = 20.6 ft (6.3m)
T T
Formula 1: H
T
16.1 ft (4.9m) > 13.5 ft (4.1m)
Since this formula is not met, this vent configuration is unacceptable.
Formula 2: H
T
20.6 ft (6.3m) < 40 ft (12.2m)
Since only formula 2 is met, this vent configuration is unacceptable and a new appliance location or vent configuration will
need to be established to satisfy both formulas.
16
W415-2362 / A / 10.25.19
Required vertical
rise in feet
(meters) V
< 3V
T
3V = 3 ft (0.9m) x 4.5 ft (1.4m) = 13.5 ft (4.1m)
T
+ V < 40 ft (12.2m)
T
(H ) > (V )
T T
See graph to determine the required vertical rise V
required horizontal run H
20 (6.1)
19 (5.8)
10 (3.1)
T
3 (0.9)
0 5 10 (3.1)
(1.5)
Horizontal vent run plus offset in feet (meters) H
The shaded area within the lines represents acceptable
values for H
90°
V
1
for the
T
.
T
25
15 20
(7.6)
(4.6) (6.1)
T
and V
T T
90°
V
3
H
2
H
V
1
2
90°
30
(9.1)
90°