Napoleon BGD36CFNTR Installation And Operating Instructions Manual page 14

14
BGD36CF REAR EXIT / HORIZONTAL TERMINATION
when (H ) > (V )
T T
Simple venting confi guration (only two 90° elbows)
FIGURE 27
See graph to determine the required vertical rise V
required horizontal run H
REQUIRED
VERTICAL
RISE IN
INCHES
V
T
HORIZONTAL VENT RUN PLUS OFFSETS IN FEET
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 < 3.5V
T
Formula 2: H + V
T
W415-0566 / D / 08.30.07
T
T
< 24.75 feet
T
Example 5:
H
1
for the
T
V = 4 ft
1
V = 1.5 ft
2
V = V + V
T 1
H = 2 ft
1
H = 1 ft
2
H = 1 ft
3
H = 1.5 ft
4
H = H + H
R 1
H = .03(four 90° elbows + one 45° elbow - 90°)
O
= .03(90 + 90 + 90 + 90 + 45 - 90) = 9.45 ft
H = H
T R
H + V = 14.95 + 5.5 = 20.45 ft
T T
Formula 1: H
H
T
14.95 < 19.25
Formula 2: H
20.45 < 24.75
Since both formulas are met, this vent confi guration is
acceptable.
90°
V
45°
H
2
H
V 3
1
90°
= 4 + 1.5 = 5.5 ft
2
+ H + H = 2 + 1 + 1 + 1.5 = 5.5 ft
2 3 4
+ H = 5.5 + 9.45 = 14.95 ft
O
< 3.5V
T T
3.5V = 3.5 x 5.5 = 19.25 ft
T
+ V < 24.75 feet
T T
90°
H
4
2
90°
FIGURE 28