{"data":{"id":"us-nyc/n.y.c.-admin.-code-27-894","jurisdiction":"us-nyc","citation":"N.Y.C. Admin. Code § 27-894","heading":"§ 27-894 Thimbles.","body":"(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.\n\n(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:\n\n(1) For equipment conforming to standards – four inches larger in diameter than the vent connector.\n\n(2) For equipment having draft hoods – six inches larger in diameter than the vent connector.\n\n(3) For equipment without draft hoods – twelve inches larger in diameter than the vent connector.","path":["New York City Administrative Code","Title 27","Chapter 1: Building Code"],"source_url":"https://files.amlegal.com/pdffiles/NewYorkCity/Admin/XML.zip","current_through":"Local Law 2026/135 (enacted August 31, 2026)","vintage":"","retrieved_at":"2026-09-06T02:48:57Z","sha256":"61349ae398bd7254c364efdd3a68df15f7571341369926db64d09e0cdd4a6b7e","source_id":"us-nyc","stale":false,"prev":"us-nyc/n.y.c.-admin.-code-27-893","next":"us-nyc/n.y.c.-admin.-code-27-895"},"notice":"GroundRules: Original legal text. Not legal advice."}