Dunkirk XEB-4 Operations Instructions download pdf (Page 7)

EXAMPLE 1: Boiler Located In Unconfined Space

An unconfined space is defined as a space whose volume is not less than 50 cubic feet per 1,000 Btu per hour of the total input rating of all

appliances installed in that space.

If your boiler is in an open area (non-partitioned basement) in a conventional house, the air that leaks through the cracks around doors and

windows will usually be adequate to provide air for combustion. The doors should not fit tightly. Do not caulk the cracks around the win-

dows.

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Equipment located in buildings of tight construction shall be provided with air for combustion, ventilation, and dilution of flue

gases using the methods described in example 2 (below) or shall be specially engineered. The authority having jurisdiction must

approve specially engineered installations, a building of tight construction is defined as: 1) walls exposed to the outdoor atmo-

sphere have a continuous water vapor retarder with a rating of one perm or less with openings gasketed or sealed; and 2) openable

windows and doors which meet the air leakage requirements of the International Energy Conservation Code, Section 502.1.4; and

3) caulking or sealants are applied to areas such as joints around window and door frames, between sole plates and floors, between

wall-ceiling joints, between wall panels, at penetrations for plumbing, electrical and gas lines, and at other openings.

EXAMPLE 2: Boiler Located in Confined Space

1. All Air from Inside the Building: The confined space shall be provided with two permanent openings communicating directly with

an additional room(s) of sufficient volume so that the combined volume of all spaces meets the criteria for an unconfined space. The

total input of all gas utilization equipment installed in the combined space shall be considered in making this determination. Eachopen-

ing shall have a minimum free area of one square inch per 1,000 Btu per hour of the total input rating of all gas utilization equipment in

the confined space, but not less that 100 square inches. One opening shall be within 12 inches of the top and one within 12 inches of the

bottom of the enclosure. The minimum dimension of air openings shall not be less than 3 inches (see Figure 3A).

Figure 3A - Boiler Located in Confined Space

Chimney

GasVent

Vent Pipe_

) Openings

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Dunkirk XEB-4 Operations Instructions Page 7