Combustion And Ventilation Air - Kenmore N8MSL0701412A1 Installation Instructions Manual
80% single stage psc motor category i, gas furnace
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FURNACE CORROSION
HAZARD
Failure to follow this caution may result in furnace
damage.
Air for combustion
must
not be contaminated
by
halogen compounds,
which include fluoride, chloride,
bromide, and iodide. These elements
can corrode
heat
exchangers
and
shorten
furnace
life.
Air
contaminants
are
found
in
aerosol
sprays,
detergents,
bleaches,
cleaning
solvents,
salts, air
fresheners, and other household products.
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in personal
injury or death.
The operation
of exhaust
fans,
kitchen ventilation
fans, clothes dryers, attic exhaust fans or fireplaces
could create a NEGATIVE PRESSURE
CONDITION
2. Figure 7 illustrates
how to provide TWO OUTDOOR
OPENINGS,
one inlet and one outlet combustion
and
ventilation air opening, to the outdoors.
a. One opening MUST commence within 12 in. (300
mm) of the ceiling and the second opening MUST
commence within 12 in. (300 mm) of the floor.
b. Size openings and ducts per Figure 7 and Table 2.
c. TWO HORIZONTAL
DUCTS require 1 sq./in, of free
area per 2,000 Btuh (1,100 mm2/kW) of combined
input for all gas appliances in the space per
Figure 7 and Table 2.
d. TWO OPENINGS OR VERTICAL DUCTS require 1
sq./in, of free area per 4,000 Btuh (550 mm2/kW)
for combined input of all gas appliances in the
space per Figure 7 and Table 2.
3. ONE OUTDOOR OPENING requires:
a. 1 square inch of free area per 3,000 Btuh (734
mm2/kW) for combined input of all gas appliances
in the space per Table 2 and
b. Not less than the sum of the areas of all vent con-
nectors in the space.
at the furnace. Make-up air MUST be provided for the
ventilation devices, in addition to that required by the
furnace. Refer to Carbon Monoxide Poisoning Hazard
warning
in venting
section of these
instructions
to
determine
if an adequate amount of make-up
air is
available.
The requirements for combustion and ventilation air depend
upon whether or not the furnace is located in a space having
a volume of at least 50 cu/ft, per 1,000 Btuh input rating for all
gas appliances
installed in the space.
Spaces having less than 50 cu/ft, per 1,000 Btuh
require the OUTDOOR COMBUSTION AIR
METHOD.
Spaces having at least 50 cu/ft, per 1,000 Btuh may
use the INDOOR COMBUSTION
AIR, STANDARD
or KNOWN AIR INFILTRATION METHOD.
Outdoor
Combustion
Air Method
1. Provide the space with sufficient air for proper combus-
tion, ventilation,
and dilution of flue gases using per-
manent horizontal or vertical duct(s) or opening(s) dir-
ectly communicating
with the outdoors or spaces that
freely communicate
with the outdoors.
The opening shall commence
within 12 in. (300 mm) of the
ceiling. Appliances
in the space shall have clearances of at
least 1 in. (25 mm) from the sides and back and 6 in. (150
mm) from the front. The opening shall directly communicate
with the outdoors or shall communicate
through a vertical or
horizontal duct to the outdoors or spaces (crawl or attic) that
freely communicate with the outdoors.
Indoor Combustion
Air NFPA & AGA
Standard
and Known-Air-Infiltration
Rate Methods
Indoor
air
is permitted
for
combustion,
ventilation,
and
dilution, if the Standard
or Known-Air-Infiltration
Method
is used.
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning
could result in death
and/or personal injury.
Many homes require air to be supplied from outdoors
for furnace combustion, ventilation, and dilution of flue
gases. The furnace combustion
air supply must be
provided in accordance with this instruction manual.
Table 2--Minimum
Free Area Re(
uired for Each Combustion
Air Opening
of Duct to Outdoors
TWO OPENINGS OR VERTICAL
DUCTS
(1 SQ. IN./4,000 BTUH)
(550 SQ. MM/KW)
TWO HORIZONTAL
DUCTS
SINGLE DUCT OR OPENING
FURNACE
(1 SQ. IN./2,000 BTUH)
(1 SQ. IN./3,000 BTUH)
INPUT
(1,100 SQ. MM/KW)
(734 SQ. MM/KW)
(BTUH)
Free Area of
Round Duct
Free Area of
Round Duct
Free Area of
Round Duct
Opening and Duct
Dia.
Opening and Duct
Dia.
Opening and Duct
Dia.
Sq. In. (Sq. mm)
In. (mm)
Sq. In. (Sq. mm)
In. (mm)
Sq. In. (Sq. mm)
In. (mm)
44,000
22 (14194)
6 (152)
14.7 (9484)
5 (127)
11 (7096)
4 (102)
66,000
33 (21290)
7 (178)
22.0 (14193)
6 (152)
16.5 (10645)
5 (127)
88,000
44 (28387)
8 (203)
29.3 (18903)
7 (178)
22 (14193)
6 (152)
110,000
55 (35484)
9 (229)
36.7 (23677)
7 (178)
27.5 (17742)
6 (152)
132,000
66 (42580)
10 (254)
44.0 (28387)
8 (203)
33 (21290)
7 (178)
154,000
77 (49677)
10 (254)
51.3 (33096)
9 (229)
38.5 (24839)
8 (203)
EXAMPLES: Determining Free Area
FURNACE
WATER HEATER
TOTAL INPUT
110,000
+
30,000
(140,000 divided by 4,000)
=
35.0 Sq. In. for each two Vertical Ducts or Openings
66,000
+
40,000
(106,000 divided by 3,000)
=
35.3 Sq. In. for a Single Duct or Opening
88,000
+
30,000
(118,000 divided by 2,000)
=
59.0 Sq. In. for each of two Horizontal Ducts
8
441 01 1402 02
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