maintaining clearances to the ceiling as noted in Figure 6. 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 collar to the tee-box using #24 ga. minimum blued or black steel connector pipe. (DO NOT USE GALVANIZED PIPE.) Connect each section so the 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 the masonry fireplace wall pass-through connector thimble meets the NFPA-211Code 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. (See Figure 7.)
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 the NFPA-211Code. 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 1800o F.