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Connectors may pass through walls or partitions constructed of combustible material if
connector is:
(a) Either listed for wall pass-through or is routed through a device listed for wall pass-
through and is installed in accordance with conditions of listing.
(b) Selected or fabricated in accordance with conditions and clearances as stated
in NFPA-211 Code. Any unexposed metal that is used as part of a wall pass-through
system and is exposed to flue gases shall be constructed of stainless steel or other
equivalent material that will resist corrosion, softening or cracking from flue gases at
temperatures up to 1800
o
F.
In addition, a connector to a masonry chimney shall extend through wall to the inner face
or liner but not beyond, and shall be firmly cemented to masonry.
EXCEPTION: A thimble may be used to facilitate removal of the chimney connector for
cleaning, in which case the thimble shall be permanently cemented in place
with high-temperature cement.
2. Once through-the-wall thimble codes are met, simply connect chimney collar to wall pass-
through connector using #24 ga. minimum, blue or black steel connector pipe as follows:
(a) Maintain 1/4" rise per foot (horizontal length) from appliance to chimney.
(b) Connect each section so crimped end faces downward.
(c) Secure each section to each other using at least three (3) sheet metal screws or rivets
(See Figure 10. Page 15).
(d) Use three (3) sheet metal screws to fasten pipe to connector collar on heater.
(See Figure 10. Page 15).
Page 17