41978-1-1220
Page 37
TOP VENT - VERTICAL TERMINATION
NO ELBOWS
Minimum
Maximum
(Dimensions In Inches)
120 (10ft)
480 (40ft)
Figure 49
TWO 90° ELBOWS
EXAMPLE VENT RUNS
Initial Pipe
Length
A (Vertical)
Minimum
B (Horizontal)
Maximum
(Dimensions In Inches)
12
120 (10ft)
222 (18ft, 6in)
24
120 (10ft)
222 (18ft, 6in)
36
120 (10ft)
222 (18ft, 6in)
48
120 (10ft)
222 (18ft, 6in)
*Maximum horizontal run is 100% of vertical, but cannot exceed
20 feet.
Figure 50
THREE 90° ELBOWS
NOTE:
Subtract 3 feet from the total horizontal measurement for
each 90° elbow installed horizontally. Subtract 1-1/2 feet from
the total horizontal measurement for each 45° elbow installed
horizontally.
EXAMPLE VENT RUNS
Initial Pipe
Length
A (Vertical)
Minimum
B (Horizontal)
Maximum
(Dimensions In Inches)
12
120 (10ft)
186 (15ft, 6in)
24
120 (10ft)
186 (15ft, 6in)
36
120 (10ft)
186 (15ft, 6in)
48
120 (10ft)
186 (15ft, 6in)
*Maximum horizontal run is 100% of vertical, but cannot exceed
17 feet.
Figure 51