Combustion & Ventilation Air; Outdoor Combustion Air Method; Confined Space Installation - ICP *9MPT050F12 Installation Instruction

3. Combustion & Ventilation Air
For Single Pipe Installation
(Non- -Direct Vent)
WARNING
!
CARBON MONOXIDE POISONING HAZARD
Failure to provide adequate combustion and
ventilation air could result in death or personal
injury.
Use methods described
combustion and ventilation air.
Furnaces require ventilation openings to provide sufficient air for
proper combustion and ventilation of flue gases. All duct or open-
ings for supplying combustion and ventilation air must comply with
National Fuel Gas Code, NFPA54/ANSI Z223.1, 2002 (or current
edition) and applicable provisions of local building codes.
1. Section 8.3, Air for Combustion and Ventilation, of the Nation-
al Fuel Gas Code, National Fuel Gas Code (NFGC), ANSI
Z223.1--2002/NFPA 54--2002 in the U.S.,
2. Sections 7.2, 7.3, 7.5, 7.6, 7.7, and 7.8 of National Standard of
Canada, Natural Gas and Propane Installation Code
(NSCNGPIC), CSA B149.1--05 in Canada,
3. Applicable provisions of the local building code.
This furnace can NOT be common vented or connected to any
type B, BW or L vent or vent connector, nor to any portion of a facto-
ry--built or masonry chimney. Multistory venting is NOT permitted.
If this furnace is replacing a previously common-vented furnace, it
may be necessary to resize the existing vent and chimney to pre-
vent oversizing problems for the other remaining appliance(s).
See "Venting and Combustion Air Check" in this section. This fur-
nace MUST be vented to the outside.
When the installation is complete, check that all appliances have
adequate combustion air and are venting properly. See Venting
And Combustion Air Check in "5. Gas Vent Installation" Section in
this manual.
Outside Air (This is ONLY a guide. Subject to codes of country having jurisdiction.)
Figure 5
This installation NOT approved in Canada
Gas Vent
Ventilated Attic
Top Above Insulation
Outlet Air (1)
Ventilated Crawl Space
Alternate Inlet Air (1)
c. Horizontal duct openings require 1 square inch of free
area per 2,000 BTUH (1,100 mm
for all gas appliances in the space (see Table 1).
8
here to provide
Gable Vent
Alternate Inlet Air (1)
Gas Vent
Soffit Vent
Inlet
Air (1)
2
/kW) of combined input

Outdoor Combustion Air Method

A space having less than 50 cubic feet per 1,000 BTUH input rating
for all gas appliances installed in the space requires outdoor air for
combustion and ventilation.
Air Openings and Connecting Ducts
1. Total input rating for all non direct vent gas appliances
MUST be considered when determining free area of open-
ings.
2. Connect ducts or openings directly to outside.
3. When screens are used to cover openings, they MUST be
no less than
4. The minimum dimension of rectangular air ducts MUST
NOT be less than 3².
5. When sizing grille or louver, use the free area of opening. If
free area is NOT stamped or marked on grill or louver, as-
sume a 20% free area for wood and 60% for metal.

Confined Space Installation

NOTE: A confined space is defined as an area with less than 50
cubic feet per 1,000 BTUH input rating for all gas appliances
installed in the area.
Requirements
1. Provide confined space with sufficient air for proper com-
bustion and ventilation of flue gases using horizontal or ver-
tical ducts or openings.
2. Figure 5 illustrate how to provide combustion and ventila-
tion air. A minimum of two permanent openings, one inlet
and one outlet, are required.
a. One opening MUST commence within 12² of the floor
and the second opening MUST commence within 12² of
the ceiling.
b. Size openings and ducts per Table 1.
Gable Vent
Ventilated Attic
Top Above Insulation
Soffit Vent
OutletAir (1)
Inlet
Air (2)
d. Vertical duct openings or openings directly communicat-
ing with the outdoors require 1 square inch of free area
per 4,000 BTUH (550 mm
gas appliances in the space (see Table 1).
1
/ ² mesh.
4
Gas Vent
Outlet
Air (1)
Inlet
Air (1)
Minimum One Inlet and One Outlet Air Supply is Required
May be in any Combination Shown
Inlet Air Opening Must be Within12² of floor
Outlet Air Opening Must be Within12² of ceiling
(1) 1 Square Inch per 4000 BTUH
(2) 1 Square Inch per 2000 BTUH
2
/kW) for combined input of all
Outlet
Air (2)
Inlet
Air (2)
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