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One 90
°
Elbow
A
TO BOTTOM
OF UNIT
B
INSTALLED
VERTICALLY
1’
MINIMUM
EXAMPLE VENT RUNS
INITIAL
PIPE
LENGTH
A (Vertical)
B (Horizontal)
12”
4’-3.5”
2’ MAXIMUM
24”
5’-3.5”
9’ MAXIMUM
36”
6’-3.5”
14’ MAXIMUM
EXAMPLE C
4’
7’-3.5”
17’ MAXIMUM
EXAMPLE B
20’-6”
23’-9.5”
10’ MAXIMUM
EXAMPLE A
28’-6”
31’-9.5”
5’ MAXIMUM
Figure 34
Note
: Pipe straps must be used every 2 feet to secure venting.
Two 45° Elbows
Installation requirements to replace the first 90° elbow with two
45° elbows:
B
A
EXAMPLE VENT RUNS
INITIAL PIPE
LENGTH
A (Vertical)
B (Horizontal)
24”
6’
9’ MAXIMUM
36”
7’
14’ MAXIMUM
4’
8’
20’ MAXIMUM
12’
16’
15’ MAXIMUM
24’
28’
7’-6” MAXIMUM
Figure 35
Two 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 hori
-
zontally.
1’
MININUM
INSTALLED
HORIZONTALLY
B
A
EXAMPLE VENT RUNS
INITIAL PIPE
LENGTH
A (Vertical)
B (Horizontal)
3’
6’-3.5”
11’ MAXIMUM
4’
7’-3.5”
17’ MAXIMUM
4’-6”
7’-9.5”
17’-16” MAXIMUM
12’-6”
15’-9.5”
11’-6” MAXIMUM
24’-6”
27’-9.5”
4’-6” MAXIMUM
Figure 36
Three 90
°
Elbows
1’
MININUM
B
INSTALLED
VERTICALLY
INSTALLED
VERTICALLY
A
TO BOTTOM
OF UNIT
EXAMPLE VENT RUNS
INITIAL PIPE
LENGTH
A (Vertical)
B (Horizontal)
1’ MINIMUM
6’-6”
7’ MAXIMUM
1’ MINIMUM
7’-6”
14’ MAXIMUM
1’ MINIMUM
8’
17’ MAXIMUM
1’ MINIMUM
16’
12’ MAXIMUM
1’ MINIMUM
32’
2’ MAXIMUM
Figure 37
TOP VENT - HORIZONTAL TERMINATION
