ICP 8MPT Installation Insrtuctions page 10

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 8 illustrates how to provide combustion and ventila-
tion air when two permanent openings, one inlet and one
outlet, are used.
Air Openings and Connecting Ducts
1. Total maximum input ratings for all gas appliances in the
space MUST be considered when determining free area of
openings.
2. Connect ducts or openings directly to the outdoors.
3. When screens are used to cover openings, the openings
MUST be no smaller than 1/4" (6.4 mm) mesh.
4. The minimum dimension of air ducts MUST NOT be less
than 3" (76 mm).
5. When sizing grille, louver or screen, use the free area of a.
opening. If free area is NOT stamped or marked on grill or
louver, assume a 20% free area for wood and 60% for met-
al. Screens shall have a mesh size not smaller than
1/4"
One opening MUST commence within 12" (305 mm) of
the floor and the second opening MUST commence
within 12" (305 mm) of the ceiling.
(76mm). b. Size openings and ducts per Table 1.
Outdoor Air (This is ONLY a guide. Subject to codes of country having jurisdiction.)
Thisinstallation NOT approvedin Canada
Minimum One Inlet and One Outlet Air Supply is Required
May be in and Combination Shown
Inlet Air Opening Must be Within12"(300mm} of floor
Outlet Air Opening Must be Within12"(300mm} of ceiling
(1} 1 Square Inch per 4000 BTUH
(2} 1 Square Inch per 2000 BTUH
Gas Vent _,.Gable
Vent
/Ventilated AtticS.
T9pAbove Insulation_
I I _
I
TM
I I] I sOffit Vent
Outlet Air (1)
Outlet
JL I Io sl II I Air(l)
_u ,c I
LI _t"_"
,._et
3"I I I'_-°'1 _ _ Air (2)
Inlet
Air (1)
o°s
Outlet
_ Air (2)
Air (2)
3,
c. Horizontal duct openings reguire 1 square inch of free
area per 2,000 BTUH (11 cmZ/kW) of combined input for
all gas appliances in the space (see Table 1).
d. Vertical duct openings or openings directly communicat-
ing with the outdoors require 1 square inch of free area
per 4,000 BTUH (5.5 cm2/kW) for combined input of all
gas appliances in the space (see Table 1).
When one permanent outdoor opening is used, the opening
requires:
a.
b,
1 sq. in of free area per 3,000 BTUH (7 cm2/kW) for com-
bined input of all gas appliances in the space (see
Table 1) and
not tess than the sum of the areas of all vent connectors
in the space.
The opening shall commence within 12" (305 mm) of the top ofthe
enclosure. Appliances shall have clearances of at least 1" (25
mm) 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 out-
doors.
4,
Combination of Indoor and Outdoor Air shall have:
a. Indoor openings that comply with the Indoor Combus-
tion 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 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.
44101 202301
Specifications are subject to change without notice
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