17
top exit horizontal termination
Simple venting configuration (only one 90° elbow)
See graph to determine the required vertical
rise
V
T
for the required horizontal run
H
T
.
HORIZONTAL VENT RUN PLUS OFFSET IN FEET
(METERS) H
T
The shaded area within the lines represents
acceptable values for H
T
and V
T
For vent configurations requiring more than one 90° elbow, the following formulas apply:
= V
1
+ V
2
= 3 FT (0.9m ) + 8 FT (2.4m) = 11 FT (3.4m)
=
H
1
+
H
2
= 2.5 FT (0.8m) + 2 FT (0.6m) = 4.5 FT (1.4m)
H
O
= .03 (three 90° elbows - 90°) = .03
(270° - 90°) = 5.4 FT (1.7m)
FT (3.4m) = 20.9 FT (6.4m)
20.9 FT (6.4m) < 40 FT (12.2m)
Since both formulas are met, this vent confi guration is acceptable.
90°
H
2
V
2
90°
90°
H
1
V
1
W415-1679 / D / 03.09.18