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maintaining clearances to ceiling as noted in Figure 6. This will give you center of
hole for chimney penetration.
4. After locating center of penetration, install tee box and chimney as per chimney
manufacturer's specifications.
5. Connect chimney collar to tee-box using #24 ga. minimum blued or black steel connector
pipe. (DO NOT USE GALVANIZED PIPE). Connect each section so crimped end faces
downward and secure each section to each other using three (3) sheet metal screws or rivets.
C. Wall Exit Into Masonry (Using Single Wall Pipe)
1. Before connecting these units to a masonry chimney, determine that masonry fireplace
wall pass-through connector thimble meets NFPA-211 Code and local building codes
and is a minimum of 18" from ceiling. If connector thimble does not meet these codes, t
pass-through connector must be modified. (See Figure 7.)
igure 7
F
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.
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