Napoleon GD36NTR Installation And Operation Instructions Manual page 12

12
REAR EXIT / HORIZONTAL TERMINATION
(H
Simple venting confi guration
(only two 90° elbows)
See graph to determine the required vertical rise V
required horizontal run H
REQUIRED
VERTICAL
RISE IN
FEET V
T
HORIZONTAL VENT RUN PLUS OFFSET IN FEET H
The shaded area within the lines represents acceptable
values for H and V .
T T
For vent confi gurations requiring more than two 90° elbows
the following formulas apply:
Formula 1: H < V
T
Formula 2: H + V
T
W415-0210 / R / 02.27.08
NorthlineExpress.com
) < (V )
T T
FIGURE 11
for the
T
T
T
< 40 feet
T
http://www.northlineexpress.com
Example 4:
V
= 9 ft
1
V
= 6 ft
2
V = V + V
= 9 + 6 = 15 ft
T 1 2
H
= 3 ft
1
H
= 2 ft
2
H
= 1.5 ft
3
H = H + H + H
R 1 2
H
= .03(four 90° elbows - 90°)
O
= .03(90 + 90 + 90 + 90 - 90) = 8.1 ft
H = H + H
= 6.5 + 8.1 = 14.6 ft
T R O
H + V
= 14.6 + 15 = 29.6 ft
T T
H < V
Formula 1:
T
T
14.6 < 15
H + V
Formula 2:
T
29.6 < 40
Since both formulas are met, this vent confi guration is
acceptable.
90°
H
V
3
2
90°
H
2
90°
V
1
H
FIGURE 12
1
90°
= 3 + 2 + 1.5 = 6.5 ft
3
T
< 40 feet
T
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