Napoleon BGD36CFNTR Installation And Operating Instructions Manual page 19

BGD42CF VERTICAL TERMINATION
when (H ) < (V )
T T
Simple venting confi gurations
FIGURE 38
See graph to determine the required vertical rise V
required horizontal run H .
T
MAXIMUM
VERTICAL
R I S E I N
FEET
V
T
HORIZONTAL VENT RUN PLUS OFFSET IN FEET
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
Example 8:
FIGURE 39
45°
V = 5 ft
for the 1
T
V = 10 ft
2
V = V + V
T 1
H = 3 ft
1
H = 2.5 ft
2
H = H + H
R 1
H = .03 (one 45° elbow + three 90° elbows - 135°)
O
= .03 (45 + 90 + 90 +90 - 135) = 5.4 ft
H = H + H
T R
H + V = 10.9 + 15 = 25.9 ft
T T
Formula 1: H
10.9 < 15
Formula 2: H
25.9 < 40
Since both formulas are met, this vent confi guration is
acceptable.
H
T
90°
V
1
45°
H
1 90°
= 5 + 10 = 15 ft
2
= 3 + 2.5 = 5.5 ft
2
= 5.5 + 5.4 = 10.9 ft
O
< V
T T
+ V < 40 feet
T T
W415-0566 / D / 08.30.07
19
V
2
H
2
90°