10 G6RA, G6RK Service Manual
Figure 2. G6RA Horizontal installation on a Platform
Figure 3. Equipment in a Confined Space with all
Combustion Air Drawn from the Inside
Figure 4. Equipment in a Confined Space with all
Combustion Air Drawn from the Outside
through Vertical Ducts
If the furnace is to be suspended from the ceiling, it will be
necessary to use steel straps around each end of the
furnace. These straps should be attached to the furnace with
sheet metal screws and to the rafters with bolts. The furnace
could also be suspended by an angle iron frame bolted to the
rafters. (See Figure 1.)
Thirty six (36) inches between the front of the furnace and
adjacent construction or other appliances should be maintained
for service clearance.
Keep all insulating materials away from the louvered door.
Insulating materials may be combustible.
The G6RA may be installed directly on combustible wood
flooring or supports, if type "B-1" vent pipe is used (See
Figure 2). It is recommended for further reduction of fire
hazard that cement board or sheet metal be placed between
the G6RA and the combustible floor and extend 12 inches
beyond the front of the louvered door.
Air From Inside (See Figure 3)
If combustion air is taken from the heated space, the two
openings must
each
have a free area of at least one square
inch per 1,000 Btuh of total input of all appliances in the
confined space, but not less than 100 square inches of free
area. For example, if the combined input rate of all appliances
is less than or equal to 100,000 Btuh, each opening must
have a free area of at least 100 square inches. If the
combined input rate of all appliances is 120,000 Btuh, each
opening must have a free area of at least 120 square inches.
Total Input
Rating (Btu/hr)
40,000
60,000
80,000
100,000
120,000
140,000
160,000
Round Duct
Diameter
12"
12"
12"
12"
13"
14"
15"
Minimum
Free Area
(Each Opening)
100 sq. in.
100 sq. in.
100 sq. in.
100 sq. in.
120 sq. in.
140 sq. in.
160 sq. in.
Furnace
Openings to
adjacent space.
Each opening must
be at least 100 sq. in.
or 1 sq. in. per 1000
Btuh of total input
rating, whichever is
greater. See minimum
area per table.
12" Max.
12" Max.
Water Heater
Vent or
Chimney
Total Input
Rating (Btu/hr)
40,000
60,000
80,000
100,000
120,000
140,000
160,000
Minimum
Free Area
(Each Opening)
10 sq. in.
15 sq. in.
20 sq. in.
25 sq. in.
30 sq. in.
35 sq. in.
40 sq. in.
Round Duct
Diameter
4"
5"
5"
6"
6"
7"
8"
Inlet Air Duct must
be at least 1 sq. in.
per 4,000 Btuh of
total input rating.
Inlet and Outlet Ducts
must extend above
attic insulation.
Outlet Air Duct must
be at least 1 sq. in.
per 4,000 Btuh of
total input rating.
Ventilation Louvers at
each end of attic
Attic
Insulation
12" Max
a. All Combustion Air from Ventilated Attic.
Furnace
Water Heater
Vent or
Chimney
For venting follow the guidelines specified under the venting
section.
Gas Inlet
Electrical
Supply
Connection
Coil Plenum
Type “B” Vent
Combustible
Platform
Louver Door
Note: Line
Contact is Permissible
Furnaces installed with combustion air drawn
from a heated space which includes exhaust
fans, fireplaces, or other devices that may
produce a negative pressure should be
considered confined space installations.
WARNING:
!
Outdoor Air Using Vertical Ducts
(See Figure 4)
If combustion air is taken from outdoors through vertical
ducts, the openings and ducts must have a minimum free
area of one square inch per 4,000 Btuh of total appliance
input. In installations drawing combustion air from a ventilated
attic, both air ducts must extend above the attic insulation.
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