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thimble meets the NFPA-211 Code and local building codes and is a minimum of 18" from the ceiling. If the
connector thimble does not meet these codes, the pass-through connector must be modified.
Connectors may pass through walls or partitions constructed of combustible material if the 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 the conditions of the listing.
(b) Selected or fabricated in accordance with the 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 the 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 the through-the-wall thimble codes are met, simply connect the chimney pipe to the wall pass-through
connector using #24 ga. minimum blued or black steel pipe as follows:
(a) Maintain 1/4" rise per foot (horizontal length) from the appliance to the chimney.
(b) Each section of pipe should fit into the section below or into the opening on the stove for drip-free
operation.
(c) Secure each section to each other using at least three (3) sheet metal screws or rivets.
3. Measure up so there will be at
least 1/4" rise per foot of
horizontal connector pipe, main-
taining clearances to the ceiling as
noted in Figure 7. This will give
you the center of the hole for the
chimney penetration.
4. After locating the center of the
penetration, install the tee-box
and chimney as per the chimney
manufacturer’s specifications.
5. Connect the chimney pipe to the
tee-box using #24 ga. minimum
blued or black steel pipe. (DO
NOT use galvanized pipe.) Each
section should fit into the section
below or into the opening on the
stove, for drip-free operation.
Secure each section together by
using at least three (3) sheet metal
screws or rivets.
Wall Exit Into Masonry
(Using Single Wall Pipe)
1. Before connecting the Model 91
Bay to a masonry chimney,
determine if the masonry fire-
place wall pass-through connector
FIGURE 7
1/4” Rise Per. FT.