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5
COMBUSTION AIR
All fires need air (specifically oxygen) to burn. Furnaces, fire-
places, and wood-burning furnaces need enough oxygen for
complete combustion of their fuels. The incomplete combustion
that takes place when a furnace is "air starved" causes carbon
monoxide (CO) to be formed in quantities that can be dangerous
inside a well-sealed house. Having a source of combustion air
from outside prevents this "air starvation" of the furnace. A simple
positive air supply can be constructed using dryer vent and a
modified termination.
RETURN AIR IS VERY IMPORTANT
When installing a Clayton Furnace, return air must be incorpo-
rated into the system. Return air can be provided by installing a
separate duct system or by tying into the cold air return of an
existing gas or oil furnace. The cold air return duct can be
connected to the furnace with either a factory manufactured U.S.
Stove filter box or an equivalent fabricated from sheet metal (See
pages 22-23).
When installing a cold air return, the following minimum
size should be maintained to insure proper furnace
performance.
Model 1600M — 16" x 20" or equivalent (320 sq. in.)
Failure to provide return air ducts of the specified size
voids the furnace warranty.
A filter should be installed in the cold air return. Furnace filters
should be checked and cleaned or replaced regularly.
If return air is not provided, the warm air distributed into your home
will be restricted and the efficiency of the furnace decreased.
Without a return air system, warm air will be drawn into your
basement, unnecessarily heating unused areas of the home. In
extreme cases, if your basement or utility room is fairly air tight,
the large blower on the 1600M could depressurize the room and
pull toxic flue gases from the furnace, a gas water heater, or gas
furnace. The fumes could then be distributed throughout the
house.
INSTALLATION NO. 2
Extending the hot air duct from the furnace into the existing
plenum will help direct the flow of air from the 1600M as well as
the flow in the existing furnace. Ducting entering the existing
plenum at an angle (approximately 45 degrees) will facilitate air
flow from the furnace while diverting air from the existing furnace.
HOTBLAST
FURNACE
EXISTING
FURNACE
INSTALLATION NO. 3
The baffle on this system should be made the full width of the
furnace plenum in order to properly direct the air into the
distribution ducts.
BAFFLE
HOTBLAST
FURNACE
EXISTING
FURNACE
NO RETURN
AIR PROVIDED
EXISTING
FURNACE
INCORRECT
INSTALLATION
HOTBLAST
FURNACE
EXISTING
FURNACE
(if used)
HOTBLAST
FURNACE
HOT AIR
PLENUM
2" MIN.
1" MIN.
1" MIN.
HOT AIR DUCT
MINIMUM CLEARANCES
TO COMBUSTIBLES
9 FEET
9 FEET
CAUTION: The warm air supply outlet of the supplementary
furnace should not be connected to the cold-air return inlet of the
central furnace because a possibility exists of components of the
central furnace overheating causing it not to operate properly.