31
Venting
of the enclosure, shall be permitted where the equipment
has clearances of at least 1 inch from the sides and back
and 6 inches from the front of the appliance. The opening
shall directly communicate with the outdoors or communi-
cate through a vertical or horizontal duct to the outdoors or
spaces (crawl or attic) that freely communicate with the out-
doors, and shall have a minimum of:
A. 1 Square inch for each 3,000 BTUH of the total input rat-
ing of all equipment located in the enclosure
and
N
O
N
-
D
I
R
E
C
T
V
E
N
T
(
c
o
n
t
.
)
G
E
N
E
R
A
L
V
E
N
T
I
N
G
R
E
Q
U
I
R
E
M
E
N
T
S
A
N
D
G
U
I
D
E
L
I
N
E
S
OPTIONAL INLET AIR 1 SQ. IN.
(6.5 SQ. CM.) PER 4000 BTUH
S
T-A1194-19
F
IG D
ST-A1194-82-00
OUTLET AIR 1 SQ. IN.
(6.5 SQ. CM.) PER 2000 BTUH
INLET AIR 1 SQ. IN.
(6.5 SQ. CM.) PER 2000 BTUH
S
T-A1194-19
F
IG E
FIGURE 14
COMBUSTION AIR FITTING
FIGURE 12
N
ON-DIRECT VENT AIR FROM
A
TTIC OR CRAWL SPACE
FIGURE 13
N
ON-DIRECT VENT
O
UTSIDE AIR USING A
H
ORIZONTAL DUCT
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