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35-302 (6) 527 CMR: BOARD OF FIRE PREVENTION REGULATIONS 4.04: continued Appliances shall be located in such a manner as not to interfere with proper circulation of air within the confined space. When buildings are so tight that normal infiltration does not meet air requirements,outside air shall be introduced.Ducts used to convey air from the outdoors shall be of the same cross-sectional area as the free area S EP -_ 2 2003 of the openings to which they connect.The minimum dimension of rectangular air ducts shall be not less than three in. (76 mm). Whenever an oil appliance is used in a sealed combustion application,the air inlet and vent outlet shall be on the same surface wall. DEPT Of BUILDING INSPECTIONS 2. For residence-type installations and similar usages, the requirements of 527 CMR NORTHAMPTON,MA 01060 4.04(5)(m)1.normally may be obtained by application of one of the methods covered in 527 CMR 4.04(5)(n)1.through 3. 3. For installations of commercial and industrial equipment see 527 CMR 4.04(5)(n)6. (n) Confined and 11nnnn_finedynacec 1. Air for combustion shall be provided in the following manner: a. Through a pipe or duct connected to a suitable air intake hood located outside and connected directly to the air inlet of the burner. A suitable relief shall be provided to allow air to flow to the burner should the outside air inlet be blocked. _�7t. Through a pipe or duct connected to a suitable air intake hood located outside and corutected directly to the oil burner enclosure of a furnace or boiler. c. Through a pipe or duct connected to a suitable air intake hood located outside and connected to a enclosed vent damper located next to the burner or burners. The damper shall be closed when the burner is not operating and opened when the burner is operating. The vent damper shall be wired in the burner circuit so as to prevent the burner from operating should the damper be in a closed position. d. The size of the pipe or duct used for combustion air shall be of sufficient size to satisfy the combustion air requirements of the burner manufacturer. 2. Ventilation Air Un co fin d . a .c. a. In unconfined spaces in buildings of conventional frame, brick or stone construction,infiltration normally is adequate to provide air for ventilation. b. If the unconfined space is within a building having insufficient air because of tight construction, the air for ventilation shall be obtained from outdoors or from spaces freely communicating with the outdoors. Under these conditions a permanent opening or openings having a total free area of not less than one square inch per 5,000 Btu per hour(28 sq. in.per gal.per hr.)of total input rating of all appliances shall be provided. 3. Ventilation Air Confined Snacec. a. All Air from Inside Building. The confined space shall be provided with two permanent openings, one near the top of the enclosure and one near the bottom. Each opening shall have a free area of not less than one square inch per 1,000 Btu per hour(140 sq.in!per gal.-per hr.)of the total input rating of all appliances in the enclosuw a freely communicating with interior areas having in turn adequate infiltration from the outside. [See Figure 4.04 1.] 12/15/95 527 CMR-52.3 ? - D SEP -2 2003 4�a/w.ofD �`,(�� BUILDING INSPECTIONS NORTHAMPTON,MA 01060 _pct drllc © ° 7 `c7 / *ez-6 �vr cL C OAe 7 snV-,rr 7 The Power to Know-