Sears 9MPD100J20B1 Combustion Ventilation Air, Air Openings and Connecting Ducts, Requirements

3. Combustion	& Ventilation	Air
For Single Pipe	Installation	Air Openings and Connecting	Ducts
		Total input rating for all non direct vent gas appliances
		MUST be considered when determining free area of open-
CARBON MONOXIDE POISONING HAZARD		ings.
		2, Connect ducts or openings directly	to outside.

Failure to provide adequate combustion and

ventilation air could result in death and/or personal injury.

Use methods described here to provide 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.

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. If this furnace is replacing a previous-

ly common-vented furnace, it may be necessary to resize the existing vent and chimney to prevent oversizing problems for the

other remaining appliance(s). See "Venting and Combustion Air Check"in this section, This furnace MUST be vented to the out- side.

3.When screens are used to cover openings, they MUST be no less than 1/4" mesh.

The minimum dimension of rectangular air ducts MUST NOT be less than 3".

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

Provide confined space with sufficient air for proper com- bustion and ventilation of flue gases using horizontal or ver- tical ducts or openings.

Figure 5 illustrate how to provide combustion and ventila- tion air. A minimum of two permanent openings, one inlet and one outlet, are required.

Outside

Air (This

is ONLY

a

guide.

Subject

to

codes of

country

having

jurisdiction.)

CableVent This

installation

NOT

approved

in Canada

GasVen_.

Gas Vent

.J

x.

c,,en

....

,dNI

a___aOut,et

Outlet Air (1)')I I

Soffit

Vent

_ /

;_.-u,atio.'>_

.ir(1)I JL__q3.

II

II

II

11I

II II

r-q

I

I

]-

OutletAir'l'_]

I SoffitVent

In.let

_4........I I_;:;:,1

___.L_U, tnlet

I

I

A

_

_

--

_

I

II

I

MinimumOnelnletandOneOutletAirSupplyisRequired

I

II

I

May

bein

any Combination

Shown

Inlet

_

,r_o,

I

_"_1

I I

I

Inlet

Air

Opening Must be Within12"

of floor

alternate

lnlet Air

(1)

AIr(l)

_

Iq

[_:_"r_r

_ilrei2 )

OutletAirOpeningMustbeWithinl2"ofceiling

(1)1SquareInchper4000BTUH

(2)1SquareInchper2000B]-UH

3.

One

opening

MUST

be

within

12" of the

floor and the sec-

5.

Horizontal

duct openings require I square

inch of free area

ond

opening

within

12"

of the

ceiling.

per 2,000

BTUH of combined

input for all gas appliances in

4.

Size

openings

and

ducts

per

Table

1.

area (see Table 1).

6.Vertical duct openings or openings directly to outside re- quire 1 square inch of free area per 4,000 BTUH for com- bined input of all gas appliances in area (see Table 1).

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