Napoleon BGD36CFNTR Installation And Operating Instructions Manual page 20

20
when (H ) > (V )
T T
Simple venting confi gurations
FIGURE 40
See graph to determine the required vertical rise V
required horizontal run H
MAXIMUM VERTICAL
RISE IN 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 < 3VT
Formula 2: HT + VT < 40 feet
Example 4:
FIGURE 41
45°
W415-0566 / D / 08.30.07
BGD42CF VERTICAL TERMINATION
.
T
.
90°
H
H
1
V
1
90°
V = 1 ft
1
V = 1.5 ft
2
V = V
T 1
H = 6 ft
1
H = 2 ft
2
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
T R
H + V = 13.4 + 2.5 = 15.9 ft
T T
Formula 1:
Since this formula is not met, this vent confi guration is
unacceptable.
Formula 2:
Since only formula 2 is met, this vent confi guration
is unacceptable and a new fi replace location or vent
confi guration will need to be established to satisfy both
for the
T
formulas.
Example 5:
FIGURE 42
45°
H
T
V = 1.5 ft
1
V = 8 ft
2
V = V
T 1
H = 1 ft
1
H = 1 ft
2
H = H
R 1
H = .03 (three 45° elbow + three 90° elbows - 135°)
O
= .03 (45 + 90 + 90 +90 - 135) = 6.75 ft
V
2
H = H
T R
H + V = 13.4 + 4.5 = 29 ft
T T
2
Formula 1:
90°
Formula 2:
Since both formulas are met, this vent confi guration is
acceptable.
+ V = 1 + 1.5 = 2.5 ft
2
+ H = 6 + 2 = 8 ft
2
+ H = 8 + 5.4 = 13.4 ft
O
H < V
T T
3V = 3 x 2.5 = 7.5 ft
T
13.4 < 7.5
H + V < 40 feet
T T
15.9 < 40
90°
H
H
2
V
1
H
1
90°
+ V = 1.5 + 8 = 9.5 ft
2
+ H + H = 1 + 1 + 10.75 = 12.75 ft
2 3
+ H = 12.75 + 6.75 = 19.5 ft
O
H < V
T T
3V = 3 x 2.5 = 7.5 ft
T
13.4 < 7.5
H + V < 40 feet
T T
29 < 40
V
2
3
90°