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(a) When passing through combustible constructions, bent connectors constructed of type B gas vent material shall be installed so that the clearances required by the standard are maintained.
(b) Vent connections made of single-wall metal pipe shall not pass through any combustible walls or partitions unless they are guarded at the point of passage by ventilated metal thimbles not smaller than the following:
(1) For equipment conforming to standards – four inches larger in diameter than the vent connector.
(2) For equipment having draft hoods – six inches larger in diameter than the vent connector.
(3) For equipment without draft hoods – twelve inches larger in diameter than the vent connector.
The vent connector shall not be smaller than the size of the flue collar or the draft hood outlet of the gas-fired equipment. Where a single item of equipment has more than one draft hood outlet, the vent connector shall equal the combined area of the draft hood outlets for which it acts as a common connector to the gas vent or chimney.
Subchapter 16: Plumbing and Gas Piping
Article 1: General
The provisions of this subchapter shall establish and control the minimum requirements for the design, installation, alteration, repair, and maintenance of plumbing systems, including gas piping, sanitary and storm drainage, industrial and special wastes, sanitary facilities, water supplies and storm water and sewage disposal, except where specific exemptions are made in the code. All installation, alteration, repair, and maintenance work shall be performed by or under the direct supervision of a licensed master plumber, except as follows:
(a) Minor alterations and ordinary repairs as defined and delimited in article five of subchapter one of this chapter.
(b) Installation of gas service piping and gas meter piping may be performed by a utility corporation that is subject to the jurisdiction of the public service commission, provided that the corporation maintains and services such piping.
(c) Emergency repairs to alleviate hazardous conditions in gas distribution piping may be performed by a utility corporation which is subject to the jurisdiction of the public service commission, subject to the requirements of section 27-176 of article fifteen of subchapter one of this chapter.
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