Outside Air (This is ONLY a guide. Subject to codes of country having jurisdiction.)
GasVent
This installation NOT approved in Canada GasVent
Above Insulati,alternateInletAir (1) _ _1 _ 1_- _- _- _- _- _- _- _- _- _- _- =_
._../ GableVent _ ;::1i lr _-
_ GasVent _ Outlet _ _ II II JILL[-- ou
_ n _Vventilated Attic_ Air (,) I II Airtlet
OutletAir (1) SoffitVent I1_11 _ I II 3| II II (2)
/,IFI1 p bovelnsulation IrU-1 II II
I II I10utletAir(1) SoffitVentI."leL,_Fu'_cd Iw_;I ___-[_LL Inlet
I LL_ -,rt,, ]_._ I p,°rl L,_IFI._ Air (2)
I I I _ MinimumOneInlet and OneOutletAir Supply is Required
I I I I I Inlet May bein anyCombinationShown
Air (2)
Inlet _ ...... IU _ InletAir OpeningMust be Within12"(304.8mm)°f fl°°r
alternatelnletAir (1) Air(l) _ I I_1 _1_ OutletAir OpeningMustbe Withinl2,, (304.8mm)of ceiling
(1) 1SquareInch per4000 BTUH
(2) 1SquareInch per2000 BTUH
ConfinedSpaceInstallation
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 cm2/kW) of combined input for
all gas appliances in the space (see Table 1).
d. Vertical duct openings or openings directly
communicating 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).
3. When one permanent outdoor opening is used, the opening
a. 1 sq. in of free area per 3,000 BTUH (7 cm2/kW) for
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 openings that comply with the 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
Method.
2) Outdoor opening size reduction Factor is I minus the
Ratio in 1) above.
3) Minimum size of Outdoor openings shall be the size
required in Outdoor Combustion Air Method above
requires:
multiplied by reduction Factor.
Free Area
MinimumFreeAreaRequiredfor EachOpeningorDuctto Outdoors
STUB(kW)
Input TwoHorizontalDucts SingleOpening TwoVerticalDuctsorOpenings RoundDuct
Rating BTUH(kW) BTUH(kW) BTUH(kW) BTUH(kW)
sq.in./2,000(1cm2/,09) sq.in./3,000(1cm2/,135) sq.in./4,000(1cm2/,18) sq. in./4,000(6,5cm2/,18)
60,000(17.58) 30sq.in.(194cm2) 20sq.in.(129cm2) 15sq.in.(97cm2) 5" (127mm)
80,000(23.45) 40sq.in.(258cm2) 26.7sq.in.(172.3cm2) 20sq.in.(129cm2) 5" (127mm)
100,000(29.31) 50sq.in.(322cm2) 33.3sq.in.(214.8cm2) 25sq.in.(161cm2) 6" (152.4mm)
EXAMPLE: Determining Free Area
Furnace Water Heater Total Input
100,000 + 30,000 = (130,000 + 4,000) 32.5 Sq. In. Vertical
29.31 8.8 (38.11 + .18) 210 cm_Vertical
Furnace Water Heater Total Input
100,000 + 30,000 = (130,000 + 2,000) 65 Sq. In. Horizontal
29.31 8.8 (38.11 + .09) 423 cm2 Horizontal
440 01 1051 03 Specifications are subject to change without notice. 11
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