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I&O manual
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5.
An opening may be used in lieu of a duct to provide to provide the
outside air supply to an appli ance unless otherwise permitted by
the authority having jurisdiction. The opening shall be located
within 12” (30.5 cm) horizontally from the burner level of the appli-
ance. Refer to “COMBUSTIO N AIR SOURCE FROM OUTDOORS
and VENT AND SUPPLY AIR SAFETY CHECK” in these instruc-
tions for additional informati on and safety check procedure.
1.
Two permanent openings, one within 12 in (305 mm) of the top
and one within 12 in (305 mm) of bottom of the confined space,
Two permanent openings, shall communi cate directly or by means
of ducts with the outdoors, crawl spaces or attic spaces.
2.
One permanent openings, commencing within 12 in (305 mm)of
the top of the enclosure shall be permitted where the equipment
has clearances of at least 1 in (25.4 mm) from the sides and back
and 6 in (152.4 mm) from the front of the appliance. The opening
shall communicate directly with the outdoors and shall have a min-
imum free area of:
a. 1 square in per 3000 Btu per hour (734 mm2/kW) of the total
input rating of all equipment located in the enclosure.
b.
Not less than the sum of all vent connectors in the confined
space.
3.
The duct shall be least the same cross-sectional area as the free
area of the air supply inlet opening to which it connects.
4.
The blocking effects of louvers, grilles and screens must be given
consideration in calculating free area. If the free area of a specific
louver aor grille is not known. Refer to Table ,“Estimated Free
Area” to estimated free area.
Table 7 : Estimated Free Area
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The ventilated attic space or a crawl space from which the combustion
air is taken must comply with the requirements specified in “Combustion
Air Source from Outdoors” in this instruction or in Section 7.4, Air
for Combustion and Ventilation of the National Fuel Gas Code, ANSI
Z223.1 (latest edition). This type in stallation requires two properly sized
pipes. One brings combustion air from a properly ventilated attic space
or crawl space and a second pipe that extends from the furnace vent
connection (top right of unit) to the exterior of the building.
Wood or Metal
Louvers or Grilles
Wood 20-25%
Metal 60-70%
Screens +
1/4” (0.635cm)
mesh or larger 100%
When a Category I furnace is removed or replaced, the original
venting system may no longer be correctly sized to properly vent
the attached appliances.
An improperly sized vent system can cause CARBON MONOXIDE
to spill into the living space causing personal injury, and or death.
Table 6 : Minimum Free Area Required for Each Opening
b) All air from outdoors:
BTUH Input
Rating
Minimum Free Area Required for Each Opening
Horizontal Duct
(2,000 BTUH)
Vertical Duct or
Opening to Outside
(4,000 BTUH)
Round Duct
(4,000 BTUH)
50,000
25 in
2
(129 cm
2
)
12.5 in
2
(81 cm
2
)
4” (10 cm)
80,000
40 in
2
(258 cm
2
)
20 in
2
(129 cm
2
)
5” (13 cm)
90,000
45 in
2
(290 cm )
2
22.5 in
2
(145 cm
2
)
6” (15 cm)
70,000
35 in
2
(226 cm )
2
17.5 in
2
(113 cm
2
)
5” (13 cm)
100,000
120,000
50 in
2
(323 cm
2
)
25 in
2
(161 cm
2
)
6” (15 cm)
110,000
55 in
2
(355 cm )
2
27.5 in
2
(178 cm
2
)
7” (18 cm)
135,000
60 in
2
(387 cm
2
)
30 in
70 in
2
(452 cm )
2
2
(194 cm
2
)
35 in
2
(226 cm
2
)
7” (18 cm)
7” (18 cm)
EXAMPLE: Determining Free Area.
Appliance
1 Appliance
2 Total Input
100,000 + 30,000 = (130,000 4,000) = 32.5 Sq. In. Vertical
Appliance
1 Appliance
2 Total Input
100,000 + 30,000 = (130,000 2,000) = 65 Sq. In. Horizontal
Table 5 : Minimum Area in Square Inch Required for Each Opening
a) All air from inside the building:
The confined space shall be provided with two permanent openings
communicating directly with an additional room(s) of sufficient volume
so that the combined volume of all spaces meets the criteria. The total
input of all gas utilization equipment installed in the combined space
shall be considered in making this determination. Each opening shall
have a minimum free area of 1 square inch per 1,000BTU per hour of
the total input rating of all gas utilization equipment in the confined sp-
ace. One opening shall be within 12 inches of the top and one within
12 inches of the bottom of the enclosure (See Table 5).
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WARNING
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For Category I furnaces, vent installations shall be in accordance with
Parts 7 and 11 of the National Fuel Gas Code, ANSI Z223.1/NFPA 54
and or Section 7 and Appendix B of the CAS B 149.1, Natural Gas and
Propane Installation Codes, the local building codes, furnace and vent
Multi-story or common venting systems are permitted and must be
installed in accordance with the National Fuel Gas Code,
ANSI Z223.1/NFPA 54 and / or the CSA B 149.1, Natural Gas and
Vent connectors serving Category I furnaces shall not be connected
into any portion of mechanical draft systems operating under positive
pressure.
BTUH Input Rating
Minimum Free Area in Square Inch
Required for Each Opening
50,000
50 in (322 cm
2
2
)
80 in (516 cm
2
2
)
100 in (645 cm
2
2
)
120 in (742 cm
2
2
)
135 in (871 cm
2
2
)
80,000
70 in (450 cm
2
2
)
70,000
100,000
90 in (580 cm
2
2
)
90,000
120,000
110 in (708 cm
2
2
)
110,000
135,000