Combustion Air Supply - Rheem LX2000 Series Installation Instructions Manual

FIGURE 1
DIMENSIONS AND CLEARANCES TO COMBUSTIBLES

COMBUSTION AIR SUPPLY

WARNING
!
THIS FURNACE MUST BE PRO-
VIDED WITH ENOUGH FRESH AIR
FOR PROPER COMBUSTION AND
VENTILATION OF FLUE GASES.
SOME HOMES MAY REQUIRE THAT
OUTSIDE AIR BE SUPPLIED TO THE
FURNACE AREA. FAILURE TO
PROVIDE ENOUGH FRESH AIR CAN
CAUSE DEATH FROM CARBON
MONOXIDE POISONING.
Adequate facilities for combustion and
ventilation must be provided in
accordance with section number 1-5,
"Air for Combustion and Ventilation," of
the Standard for Installation of Oil
Burning Equipment, NFPA No. 31 ,
latest edition or other applicable
provisions of local building codes. The
flow of combustion air to the furnace
area must not be obstructed.
Important: Air for combustion and
ventilation must not come from a
corrosive atmosphere. Any failure due
to corrosive elements in the atmosphere
is excluded from warranty coverage.
Combustion air must be free of acid-
forming chemicals such as sulphur,
fluorine and chlorine. These elements
are found in aerosol sprays, detergents,
bleaches, cleaning solvents, air
fresheners, paint and varnish removers,
refrigerants and many other commercial
and household products. Vapors from
these products when burned in a flame
form acidic compounds and are highly
corrosive when they condense.
When appliances are installed within a
confined space and combustion air is
taken from within the heated space, the
Figure 2
Openings for confined spaces
air supply must be through two
permanent openings of equal area, one
located within 12 inches of the ceiling
and one within 12 inches of the floor
(see figure 2). Refer to the rating plate
label on the furnace for information on
the minimum free area of these two
openings.
When appliances are installed in an
unconfined space in a building of con-
ventional frame, brick or stone
construction, infiltration normally is
adequate to provide for combustion
ventilation and draft control dilution. If
the unconfined space is within a
building of unusually tight construction,
a supply of combustion, ventilation and
draft control dilution air must be
obtained from outdoors or spaces freely
connected to the outdoors. Under these
conditions a permanent opening or
openings having a total free area of not
less than 1 sq. in. per 5,000 BTU/HR of
total input rating of all appliances shall
be provided. This code is found in
NFPA 31, Standard for Installation of Oil
Burning Equipment . Other State,
Provincial, and Local codes may apply,
check with local inspectors.
When appliances are installed in a
confined space within a building of
unusually tight construction, air for
combustion must be obtained from
outdoors or from spaces or ducts freely
drawing from the outdoors. Under these
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