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3.2.3.6
WALL OUTLET CONFIGURATION EXAMPLE
ASSEMBLY WITH 1 90° ELBOW
For a horizontal exhaust where Vt is
between 6 in. and 16 in we have Ht < 4'
•
Vertical rise
V1 =0.5 feet.
•
Horizontal run
H1 =4 feet.
•
Total vertical rise
V
= 0.5 feet
t
•
Horizontal
elbows
H
= 3 feet (for a 90°elbow)
e
N= 1 (qty of elbow)
H
= (N - 1) x H
C
•
Total horizontal run
H
= 0 ft. + 4 ft. = 4 ft.
t
•
0.5 < vertical rise < 1.33 ft.
0.5< 0.5pi < 1.33pi
•
Because 0.5ft. < V
use H
< 4 ft.
t
Total distance H
4 ft. + 0.5 ft. = 4.5 ft.
4.5 ft. < 40 ft.
This assembly is accepted.
3.2.3.7
ROOF EXHAUST CONFIGURATION EXAMPLE
MAX VERTICAL VENT
Direct vertical vent with no elbow
•
Vertical rise
V1 = 40 ft.
•
Horizontal run
H1 = 0 ft.
•
Total vertical rise
V
= 40 ft.
t
Horizontal equivalent of elbows
H
= (0 - 1) x 90° = 0 x 3 ft. = 0 ft.
c
•
Total horizontal run
H
= 0 ft. + 0 ft. = 0 ft.
t
•
Vertical rise < 10 ft.
40 ft. > 10 ft.
Therefore the formula H
•
3V
is not applicable
t
•
Total distance H
40 ft. + 0 ft.= 40 ft.
40 ft. < 40 ft.
This assembly is accepted.
equivalent
of
= 0 x 3 feet. = 0 feet.
e
< 1.33 ft.
t
+ V
<40 ft.
t
t
<
t
+ V
<40 ft.
t
t
37
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