UpCodes logo
Go To Full Code Chapter
(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.

Related Code Sections

§27-894 Chimneys and Gas Vents, Thimbles
or partitions unless they are guarded at the point of passage by ventilated metal thimbles not smaller than the following: (1) For equipment conforming ...
3314.11.5.1 Safeguards During Construction or Demolition, Insulated Thimble
An insulated thimble shall be used to attach each suspension wire rope to its hanging support. Excessive suspension wire rope and any additional ...
503.7.7 Chimneys and Vents, Single-Wall Penetrations of Combustible Walls
A single-wall metal pipe shall not pass through a combustible exterior wall unless guarded at the point of passage by a ventilated metal thimble ...