Table of Contents
Advertisement
when (H
) > (V
)
T
T
Simple venting confi gurations
FIGURE 12
See graph to determine the required vertical rise V
required horizontal run H
T
REQUIRED
VERTICAL
R I S E
I N
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: H
< 3V
T
Formula 2: H
+ V
T
45°
VERTICAL TERMINATION
T
.
T
< 40 feet
T
90°
H
H
1
2
V
1
90°
FIGURE 13
Example 4:
V
= 1 ft
1
V
= 1.5 ft
2
V
= V
+ V
T
1
H
= 6 ft
1
H
= 2 ft
2
H
= H
+ H
R
1
H
= .03(one 45º elbow + three 90º elbow - 135º)
O
= .03(45 + 90 + 90 + 90 - 135) = 5.4 ft
H
= H
+ H
T
R
H
+ V
= 13.4 + 2.5 = 15.9 ft
T
T
Formula 1:
H
13.4 > 7.5
Since this formula is not met, this vent confi guration is
unacceptable.
for the
Formula 2:
H
15.9 < 40
Since only formula 2 is met, this vent confi guration is
unacceptable and a new fi replace location or vent con-
fi guration will need to be established to satisfy
both formulas.
)
90°
T
45°
Example 5:
V
= 1.5 ft
1
V
= 8 ft
2
V
= V
+ V
T
1
H
= 1 ft
1
H
= 1 ft
2
H
= 10.75 ft
V
3
2
H
= H
+ H
R
1
H
= .03(three 90° elbows + two 45° elbows - 135°)
O
= .03(90 + 90 + 90 + 45 + 45 - 135) = 6.75 ft
H
= H
+ H
T
R
90°
H
+ V
= 19.5 + 4.5= 24 ft
T
T
Formula 1:
H
19.5 < 28.5
Formula 2:
H
24 < 40
Since both formulas are met, this vent confi guration is
acceptable.
= 1 + 1.5 = 2.5 ft
2
= 6 + 2 = 8 ft
2
= 8 + 5.4 = 13.4 ft
O
< 3V
T
T
3V
= 3 x 2.5 = 7.5 ft
T
+ V
< 40 feet
T
T
H
2
H
V
H
1
45°
1
FIGURE 14
90°
= 1.5 + 8= 9.5 ft
2
+ H
= 1 + 1 + 10.75 = 12.75 ft
2
3
= 12.75 + 6.75 = 19.5 ft
O
< 3V
T
T
3V
= 3 x 9.5 = 28.5 ft
T
+ V
< 40 feet
T
T
W415-0381 / H / 12.07.07
13
V
2
3
90°
Hide quick links:
Advertisement
Table of Contents
