gas utilization equipment in the area. If you are unsure that the structure meets this requirement, contact your local gas utility company or other qualified agency for a safety inspection.

Each of the two openings shall have a minimum free area of 1 square inch per 1,000 BTUH of the total input rating of all gas utilization equipment in the confined area, but not less than 100 square inches (Figure 13).

CONFINED

SPACE

I

PERMANENT

OPENINGS

INCH/1000

BTUH (MINIMUM

_100SQUARE. IN.)

FIGURE 13.

All Air from Outdoors

Outdoor fresh air can be provided to a confined area either directly or by the use of vertical and horizontal ducts. The fresh air can be taken from the outdoors or from crawl or attic spaces that freely communicate with the outdoors. Attic or crawl spaces cannot be closed and must be properly ventilated to the outside.

Ductwork must be of the same cross-sectional area as the free area of the opening to which they connect. The minimum

dimension of rectangular air ducts cannot be less than three inches.

The size of each of the two openings is determined by the method in which the air is to be provided. Refer to Table 4 to calculate the minimum free area for each opening. Figures 14, 15, 16 and 17 are typical examples of each method.

Louvers and Grilles

In calculating free area for ventilation and combustion air supply openings, consideration must be given to the blocking effect of protection louvers, grilles, and screens. These devices can reduce airflow, which in turn may require larger openings to achieve the required minimum free area. Screens must not be smaller than 114" mesh. If the free area through a particular design of louver or grille is known, it should be used in calculating the specified free area of the opening. If the design and free area are not known, it can be assumed that most wood louvers will allow 20 - 25% of free area while metal louvers and grilles will allow 60 - 75% of free area.

Louvers and grilles must be locked open or interconnected with the equipment so that they are opened automatically during equipment operation.

Keep louvers and grilles clean and free of debris or other obstructions.

TABLE 4

Minimum Free Area of Permanent Openings for Ventilation and Combustion Air Supply - All Air from Outdoors Only.

Based on total BTUH input rating for all utilizing equipment within the confined space.

 

 

Minimum Free

Area

Reference

Opening

Source

Per Opening (sq. in.)

Drawing

*Direct to outdoors

1 sq. in, per 4000

BTUH

Figure

14

Vertical

Ducts

1 sq. in, per 4000

BTUH

Figure

15

Horizontal

Ducts

1 sq. in, per 2000

BTUH

Figure

16

Single Opening

1 sq. in, per 3000

BTUH

Figure

17

Example: A water heater with an input rating of 50,000 BTUH using horizontal ducts would require each opening to have a minimum free area of 25 square inches.

Minimum free area = 50,000 BTUH x 1 sq. in. ! 2000 BTUH = 25 sq. in.

*These openings connect directly with the outdoors through a ventilated attic, a ventilated crawl space, or through an outside walt.

Consult the local codes of your area for specific ventilation and combustion air requirements.

 

 

 

 

 

 

GABLE

VENT

 

 

 

 

 

 

j

TO OUTDOORS

 

 

 

 

 

 

F

INSTALL

 

ABOVE

\

 

 

 

 

 

 

INSULATION

CONFINED

 

 

 

 

OUTLET

 

 

 

 

SPACE

 

 

 

 

AIR

TO

 

 

 

 

 

 

 

 

_,TTIC

1

SQ.

 

 

 

 

 

 

 

INCH

PER

 

 

 

 

 

 

 

 

4000

BTUH

 

 

ALTERNATE

 

 

 

 

 

 

 

FROM

 

AIR

INLET

 

 

 

CRAWL

SPACE

 

I SQ.

INCH

PER

_

 

 

OPEN

 

_K_

 

4000

BTUH

 

 

 

FOUNDATION

 

-_

 

 

 

 

 

 

 

VENT

 

 

 

ALL

AIR

FROM

OUTDOORS:

INLET

AIR FROM

VENTILATED

 

CRAWL

SPACE/OUTLET

AIR

TO

VENTILATED

 

ATTIC

 

 

 

 

FIGURE

14.

 

 

 

 

 

 

 

 

 

 

GABLE

VENT

 

 

 

 

 

 

 

TO OUTDOORS

 

 

 

 

 

[_

 

_INSTALL

 

 

ABOVE

 

 

 

 

 

_J

 

INSULATION

\

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OUTLET

AIR

 

 

 

 

 

 

 

ATTIC

 

 

 

 

 

 

 

 

1 SQ.

INCH

 

 

 

 

 

 

 

PER

4000

 

 

 

 

 

 

 

 

BTUH

 

 

 

 

 

 

 

 

 

 

INLET

 

AIR

DUCT

 

 

 

 

 

 

 

1 SQ.

INCH

PER

 

 

 

 

 

 

 

4000

BTUH

 

 

12" MAXIMUM

ALL AIR FROM OUTDOORS THROUGH VENTILATED ATTIC

FIGURE 15.

18

Page 18
Image 18
Kenmore 153.33115, 153.33114 manual All Air from Outdoors, Louvers and Grilles

153.33114, 153.33115 specifications

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