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Chimney Connectors

NYC Admin. Code tit. 27, ch. 1, subch. 15, art. 3
in effect

NYC Admin. Code § 27-870 Chimney connector construction.

§ 27-870 Chimney connector construction. Chimney connectors except those serving incinerators shall be constructed of galvanized steel of thickness conforming to the requirements listed in subdivision (a) of this section or of equivalent materials. Cleanout doors of the same material as the connector or other equivalent means shall be provided for the cleaning of connectors. Tile pipe shall not be used as a chimney connector. (a) Thickness of metal. The thickness of galvanized steel for chimney connectors shall be not less than that given in table 15-7. TABLE 15-7 Required Thickness of Galvanized Steel for Connectors Galvanized Sheet Gauge No. Area of Connector Sq. In. 24 less than 79 22 80 to 154 20 155 to 200 16 Over 200 (b) General. All chimney connectors shall be as short and as straight as possible consistent with their use and the required draft conditions. No chimney connector shall pass through a floor or ceiling construction.

NYC Admin. Code § 27-871 Chimney connection.

§ 27-871 Chimney connection. In entering a flue in a masonry or metal chimney, the chimney connector shall be installed above the extreme bottom to avoid stoppage and in such manner or by such means as to prevent the chimney connector from entering so far as to restrict the space between its end and the opposite wall of the chimney. The chimney connector shall be firmly attached or inserted into a thimble or slip joint to prevent it from falling out of place. All connectors shall fit tightly. Chimney connections to any flue shall be limited to one floor. Two or more chimney connectors may be joined to a single connection provided that the chimney connectors are on one floor level and the flue is of sufficient size to serve all of the equipment thus connected. Chimney connectors shall be inspected at the time of the initial installation by the commissioner or by a duly authorized insurance company as provided in section two hundred four of the labor law.

NYC Admin. Code § 27-872 Chimney connector clearances.

§ 27-872 Chimney connector clearances. (a) From combustible construction. The minimum distance between the chimney connector and any combustible material or construction shall be: (1) eighteen inches for chimney connectors from low temperature equipment. (2) thirty-six inches for chimney connectors from medium temperature and high temperature equipment. (b) Reduced clearances. The above clearances may be reduced as outlined in table 15-8 in accordance with the type of protection applied to the combustible material or construction. TABLE 15-8 Reduced Clearances for Chimney Connectors with Specified Form of Protection1,2,3,4 Type of Protection Where the required clearance with no protection is: Applied to the combustible material and covering all surfaces within the distance specified as the required clearance with no protection. 36 in. 18 in. 9 in. 6 in. Thicknesses are minimum. (a) 0.027 in. (23 gauge) sheet metal spaced out 1 in. 18 in. 9 in. 4 in. 2 in. (b) 3 1/2 in. thick masonry wall spaced out 1 in. and adequately tied to the wall being protected. 18 in. 9 in. 4 in. 2 in. (See Note 4.) (c) 0.027 in. (23 gauge) sheet metal on 1 in. mineral wool batts reinforced with wire or equivalent spaced out in 1 in. 12 in. 3 in. 2 in. 2 in. NOTES: 1. Spacers and ties shall be of noncombustible material. 2. All methods of protection require adequate ventilation between protective material and adjacent combustible walls and ceilings. 3. Mineral wool batts (blanket or board) shall have a minimum density of 8 lb. per cu. ft. and a minimum melting point of 1,500°F. 4. If a single wall connector passes through the masonry wall there shall be at least 1/2 in. open ventilated airspace between the connector and the masonry.

NYC Admin. Code § 27-873 Underground chimney connectors.

§ 27-873 Underground chimney connectors. Underground chimney connectors shall be covered with at least twelve inches of solid masonry or an equivalent insulation. Each cleanout opening shall be provided with double iron doors or covers, and the doors or covers shall be twelve inches apart with the intervening space filled with insulating material. The doors or covers shall be not less than 10 manufacturers standard gauge. No combustible flooring shall be permitted over such connectors.

NYC Admin. Code § 27-874 Annual inspection of chimney connectors.

§ 27-874 Annual inspection of chimney connectors. Chimney connectors for boilers subject to section two hundred four of the labor law shall be inspected at least once a year by the commissioner or by a duly authorized insurance company, as provided in subdivision (b) of section 27-793 of article two of subchapter fourteen of this chapter and shall be subject to procedures listed therein.
Source: City of New York, Charter, Administrative Code and Rules (American Legal Publishing XML export, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/newyorkcity/latest/NYCadmin/0-0-0-52739Fetched: 10/24/2026

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