Napoleon BGD36CFNTR Installation And Operating Instructions Manual page 17

BGD42CF VERTICAL TERMINATION
when (H ) < (V )
T T
Simple venting confi gurations
See graph to determine the required vertical
rise V for the required horizontal run H
T
MAXIMUM
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 one 45º and one 90°
elbow the following formulas apply:
Formula 1: HT < VT
Formula 2: HT + VT < 40 feet
FIGURE 38
45°
.
T
T
Example 3:
FIGURE 39
45°
V = 5 ft
1
V = 10 ft
2
V = V + V = 5 + 10 = 15 ft
T 1 2
H = 3 ft
1
H = 2.5 ft
2
H = H + H = 3 + 2.5 = 5.5 ft
R 1 2
H = .03 (one 45° elbow + three 90° elbows - 135°)
O
= .03 (45 + 90 + 90 +90 - 135) = 5.4 ft
H = H + H = 5.5 + 5.4 = 10.9 ft
T R O
H + V = 10.9 + 15 = 25.9 ft
T T
Formula 1: H < V
T T
10.9 < 15
Formula 2: H + V < 40 feet
T T
25.9 < 40
Since both formulas are met, this vent confi guration is ac-
ceptable.
17
V
2
90°
H
2
90°
V
1
H
90°
1
W415-0661 / C / 02.20.08