Napoleon GD36NTR Installation And Operating Instructions Manual page 18

18
Simple venting configuration
(only one 90° elbow)
For vent configurations requiring more than one 90° elbow, the following formulas apply:
Formula 1: H < 4.2 V
T
Formula 2: H + V
T
Example 2:
= V = 6 FT
V
1 T
= 3 FT
H
1
= 5 FT
H
2
= H = 3 + 5 = 8 FT
H + H
R 1 2
= .03 (two 90° elbows - 90°) = .03 (180° - 90°) = 2.7 FT
H
O
= H = 8 + 2.7 = 10.7 FT
H + H
T R O
= 10.7 + 6 = 16.7 FT
H + V
T T
Formula 1:
Formula 2:
Since both formulas are met, this vent configuration is acceptable.
Example 3:
= 4 FT
V
1
= 1.5 FT
V
2
= V = 4 + 1.5 = 5.5 FT
V + V
T 1 2
= 2 FT
H
1
= 1 FT
H
2
= 1 FT
H
3
= 1.5 FT
H
4
= H
H + H + H
R 1 2 3
= .03 (four 90° elbows - 90°) = .03 (360° - 90°) = 8.1 FT
H
O
= H = 5.5 + 8.1 = 13.6 FT
H + H
T R O
= 13.6 + 5.5 = 19.1 FT
H + V
T T
Formula 1:
Formula 2:
Since both formulas are met, this vent configuration is acceptable.
W415-0773 / 06.16.09
See graph to determine the required vertical rise V
REQUIRED
VERTICAL
RISE IN
INCHES V
The shaded area within the lines represents acceptable values for H
T
< 24.75 feet
T
H < 4.2 V
T T
= 4.2 x 6 = 25.2 FT
4.2 V
T
H + V < 24.75 FT
T T
16.7 < 24.75
= 2 + 1 + 1 + 1.5 = 5.5 FT
+ H
4
H < 4.2 V
T T
= 4.2 x 5.5 = 23.1 FT
4.2 V
T
13.6 < 23.1
H + V < 24.75 FT
T T
19.1 < 24.75
(H ) > (V )
T T
GD36
150
147"
100
T
57"
50
24"
0
5 15
10
2'
12.5'
HORIZONTAL VENT RUN PLUS OFFSET IN FEET H
90°
V
1
90°
V
for the required horizontal run H
T
150
147"
REQUIRED
VERTICAL
100
RISE IN
INCHES V
T
57"
50
10"
0
20
2'
19.5'
H
1
90°
90°
H
1
H
90°
1
16.2_2
.
T
BGD36
5 10 15 20
12.5' 19.5'
T
and V
T T
H
2
90°
H
4
V
2
H
2
3