What Is Used to Run Stove Pipe Through a Wall?

Stove Pipe Exhaust

• Wood stoves need an exit for the smoke. If a masonry fireplace already exists in your home, simply add a wood stove insert into the fireplace and use the existing chimney to exhaust the wood stove, making the connection from the flue collar on the wood stove insert all the way through the chimney and damper to the first flue tile of the masonry chimney. This may require installing a new pipe liner inside the masonry chimney to make the connection.

U.L. Approved Chimney Box or Wall Thimble

• National codes and standards require one of three approved types of lining systems through the wall or ceiling of the house to exhaust the wood stove smoke. Approved lining systems include Underwriter’s Laboratory (UL)-approved stainless steel chimney liners and an insulating system where the pipe passes through the wall or ceiling. A wall thimble or a chimney box fitted through the wall with a double- or triple-walled insulated pipe section inside it, and between the interior wall and ceiling and exterior of the house or roof meet this requirement. The wall thimble or chimney box provides space around the double- or triple-insulated pipe, which keeps flammable items from touching the insulated pipe.

Poured In Place System

• Pumped around a form, a slurry mixtures uses a vibrating bell to compress the mixture around the form. UL-approved standards must be met for the slurry mixture, which when hardened creates a hard-surface flue that runs from the top of the chimney to the damper area of the wood stove. This is used inside an existing masonry chimney through the wall or ceiling. A pipe section connects the new flue to the flue collar on the stove.

Ceramic Liner

• A ceramic liner again is used with an existing fireplace chimney whether it exits through the ceiling or the wall. Fitted inside a chimney with a setting tool specifically designed for this purpose, a pipe section then connects the wood stove to the chimney. A secondary insulator, to protect the house, is poured around the liner, both of which must meet UL fire safety standards.