Combustion And Ventilation Air - Kenmore N8MSL0701412A1 Installation Instructions Manual

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
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