17
VENT CONNECTIONS
After the location for the vent terminal has been selected as
outlined in Figures 3 & 15, use the following illustrations for
installation:
FIGURE 12
LOCATING CLEARANCE HOLE FOR VENT
Cut a clearance hole, approximately 7 in. in diameter, through
the exterior wall for the vent assembly. The recommended height
is 68 in. for 40 gal. models and 76 in. for 50 gal., 50 gal. Hi-Input
and 75 gal. models, as measured from the hole center to bottom
of water heater. The maximum height recommended is 80 in. or
in compliance with Figure 14.
Where the wall is combustible and the wall thickness is over 14
in., 1 in. clearance to combustible surfaces around the vent ter-
minal is needed. The fi rst 14 in. is zero clearance.
7 in.
DIAMETER
BOTTOM OF HEATER
(SEE TEXT)
FIGURE 13
HIGH RISE VENT ARRANGEMENT
When the height H (From vent terminal center line to bottom
of heater) is over 80 in. , it is a high rise vent arrangement. In
this case the minimum distance “D” from the center of the water
heater to the outside wall surface is 22 in., and the maximum
height of “H” is 12 ft..
TO BOTTOM
OF HEATER
WALL THICKNESS
10 in.
(REF)
D
H
FIGURE 14
FIGURE 15
*
*
*
*
*
Minimum 18 in.
12 in.
above grade or
anticipated snow
level
Minimum 12 in.
under veranda, porch,
deck or balcony
(see footnote 1)
Minimum
3 ft.
above if within
10 ft.
horizontally to
a mechanical air
supply inlet
Minimum
12 in.
from sides, above or
below a permanently
closed window or door
Minimum 9 in. for appliances with 10,000 btuh (3 Kw)
to 50,000 btuh (15 Kw) inputs and 12 in. for appliances greater
than 50,000 btuh (15 Kw) to a non mechanical air supply inlet
into building or combustion air inlet to another appliance
12 in.
from soffit
*Minimum 9 in. for appliances with
10,000 btuh (3 Kw) to 50,000 btuh
(15 Kw) inputs and 12 in.
for appliances greater than
50,000 btuh (15 Kw) to
a window or door
that may be opened
Minimum
2 ft.
from outside
corner
1. Permitted only if veranda, porch, deck or balcony is fully opened on a minimum of two sides beneath the floor.
2. A vent shall not terminate above a sidewalk or paved driveway that is located between two single family dwellings and serves both dwellings.
AREA WHERE TERMINAL IS NOT PERMITTED
VENT TERMINAL AIR SUPPLY INLET
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