Napoleon BGD36CFNTR Installation And Operating Instructions Manual page 16

16
BGD42CF HORIZONTAL TERMINATION
when (H ) < (V )
T T
Simple venting confi guration (only
one 45º and 90° elbow)
FIGURE 34
REQUIRED
VERTICAL
RISE IN FEET
(V )
T
CALCULATED HORIZONTAL VENT RUN
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 90°
elbow, the following formulas apply:
Formula 1: HT < VT
Formula 2: HT + VT < 40 feet
Example 1:
FIGURE 35
45°
V = 8 ft
1
V V = 8 ft
T 1
H = 2.5 ft
1
H = 2 ft
2
H = H + H = 2.5 + 2 = 4.5 ft
R 1 2
H = .03 (one 45° elbows + two 90° elbows - 135°)
O
= .03(225 - 135°) = 2.7 ft
H = H + H = 4.5 + 2.7 = 7.2 ft
T R O
H + V = 7.2 + 8 = 15.2 ft
T T
Formula 1: H < V
T
7.2 < 8
Formula 2: H + V
T
15.2 < 40
Since both formulas are met, this vent confi guration is acceptable.
W415-0661 / C / 02.20.08
90°
45°
PLUS OFFSETS IN FEET (H
90°
H
2
V
1
H
1
T
< 40 feet
T
when (H ) > (V )
T T
Simple venting con-
fi guration (only one
45º and 90° elbow)
FIGURE 36
See graph to deter-
mine the required
vertical rise V for the
T
required horizontal
run H .
T
REQUIRED VER-
TICAL RISE IN
INCHES V
)
The shaded area within the lines
T
represents acceptable values for H
and V .
T
For vent confi gurations requiring more than one 45º and one 90°
elbow the following formulas apply:
Formula 1: HT < 4.2 VT
Formula 2: HT + VT < 24.75 feet
Example 2:
90°
45°
V = 4 ft
1
V = 1.5 ft
2
V = V + V = 4 + 1.5 = 5.5 ft
T 1 2
H = 2 ft
1
H = 1 ft
2
H = 1 ft
3
H = 1.5 ft
4
H = H + H + H
R 1 2 3
H = .03 (one 45° elbow + four 90° elbows - 135°)
O
= .03(405 - 135) = 8.1 ft
H = H + H = 5.5 + 8.1 = 13.6 ft
T R O
H + V = 13.6 + 5.5 = 19.1 ft
T T
Formula 1: H
13.6 < 16.8
Formula 2: H
19.1 < 24.75
Since both formulas are met, this vent confi guration is accept-
able.
T
HORIZONTAL VENT
RUN PLUS OFFSETS
IN FEET (H
T
90°
90°
H
H
1
H
90°
V
1
FIGURE 37
+ H = 2 + 1 + 1 + 1.5 = 5.5 ft
4
< 4.2V
T T
4.2V = 4.2 x 5.5 = 23.1 ft
T
+ V < 24.75 feet
T T
)
T
H
3
V
4
2
2