Confined Space Installation - International comfort products C9MPX Installation Instructions Manual

Outside Air (This is ONLY a guide. Subject to codes of country having jurisdiction.)
Figure 6
Gas Vent
Ventilated Attic
Top Above Insulation a lternate Inlet Air (1)
        Â
        Â
Outlet Air (1)
Á Á Á Á Á Á Á Á Á
Á Á Á Á Á Á Á Á Á
Ventilated Crawl Space
Á Á Á Á Á Á Á Á Á
alternate Inlet Air (1)

Confined Space Installation

NOTE: A confined space is defined as an area with less than 50
cubic feet per 1,000 BTUH (4.8 cubic meters per kW) input rating
for all gas appliances installed in the area.
Requirements
1. Provide the space with sufficient air for proper combustion and
ventilation of flue gases using horizontal or vertical ducts or
openings.
2. Figure 6 illustrates how to provide combustion and ventilation
air when two permanent openings, one inlet and one outlet, are
used.
a. One opening MUST commence within 12" (304.8mm) of
the floor and the second opening MUST commence
within 12" (304.8mm) of the ceiling.
b. Size openings and ducts per Table 1.
c. Horizontal duct openings require 1 square inch of free
area per 2,000 BTUH (11 cm
all gas appliances in the space (see Table 1).
d. Vertical duct
communicating with the outdoors require 1 square inch
of free area per 4,000 BTUH (5.5 cm
input of all gas appliances in the space (see Table 1).
3. When one permanent outdoor opening is used, the opening
requires:
Table 1
Free Area
BTUH (kW)
Two Horizontal Ducts
Input
Rating
sq. in./2,000(1 cm
60,000 (17.58) 30 sq. in. (194 cm
80,000 (23.45) 40 sq. in. (258 cm
100,000 (29.31) 50 sq. in. (322 cm
EXAMPLE: Determining Free Area
Furnace
100,000 +
29.31
Furnace
100,000
+
29.31
440 01 1051 02
This installation NOT approved in Canada
Gable Vent
Gas Vent
É É
Soffit Vent
         Â
É É
Inlet
Air (1)
É É
2
/kW) of combined input for
openings or openings
2
/kW) for combined
Minimum Free Area Required for Each Opening or Duct to Outdoors
BTUH (kW)
2
/.09) sq. in./3,000 (1 cm
2
)
2
)
2
)
Water Heater
30,000 =
8.8
Water Heater
30,000
=
8.8
Specifications are subject to change without notice.
Gable Vent
Ventilated Attic
Top Above Insulation
É
Outlet Air (1)
Soffit Vent
Inlet
Air (2)
1 sq. in of free area per 3,000 BTUH (7 cm
a.
combined input of all gas appliances in the space (see
Table 1) and
b.
not less than the sum of the areas of all vent connectors in
the space.
The opening shall commence within 12" (304.8mm) of the top of
the enclosure. Appliances shall have clearances of at least 1"
(25.4mm) from the sides and back and 6" (152.4mm) 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.
4. Combination of Indoor and Outdoor Air shall have:
a. Indoor
Combustion Air Method below and
b. Outdoor openings located as required in the Outdoor
Combustion Air Method above and
c. Outdoor openings sized as follows.
1) Calculate the Ratio of all Indoor Space volume
divided by required volume for Indoor Combustion Air
directly
Method.
2) Outdoor opening size reduction Factor is 1 minus the
Ratio in 1) above.
3) Minimum size of Outdoor openings shall be the size
required in Outdoor Combustion Air Method above
multiplied by reduction Factor.
Single Opening
BTUH (kW)
2
/.135)
2
20 sq. in. (129 cm )
2
26.7 sq. in. (172.3 cm )
2
33.3 sq. in. (214.8 cm )
Total Input
(130,000 ÷ 4,000) =
(38.11 ÷ .18)
=
Total Input
(130,000 ÷ 2,000)
=
(38.11 ÷ .09)
=
Gas Vent
        Â
É É É É
Outlet
Air (1)
É É
Inlet
É É
Air (1)
Minimum One Inlet and One Outlet Air Supply is Required
May be in any Combination Shown
Inlet Air Opening Must be Within12" (304.8mm) of floor
Outlet Air Opening Must be Within12" (304.8mm) of ceiling
(1) 1 Square Inch per 4000 BTUH
(2) 1 Square Inch per 2000 BTUH
openings that comply
Two Vertical Ducts or Openings
BTUH (kW)
2
sq. in./4,000(1 cm /.18)
2
15 sq. in. (97 cm )
2
20 sq. in. (129 cm )
2
25 sq. in. (161 cm )
32.5 Sq. In. Vertical
210 c 2 Vertical
m
65 Sq. In. Horizontal
2
423 Horizontal
cm
É É
Outlet
Air (2)
Inlet
Air (2)
2
/kW) for
with the Indoor
Round Duct
BTUH (kW)
2
sq. in./4,000(6.5cm /.18)
5" (127mm)
5" (127mm)
6" (152.4mm)
11