By Chris from Cincinnati, OH on December 14, 2016
I am hoping to install a wood stove into masonry chimney with clay flue liner, that has been "relined" with HeatShield flue sealent. The flue previously served an oil furnace that has since been removed. There is an opening through the poured concrete foundation into the clay flue that measures 6 in. x 6 in. square with no combustibles nearby (see photo). The wood stove requires 6 in. pipe and I plan to use 6 in. single wall black stove pipe.
Is a thimble required? It would be a tight fit just to get the black stove pipe into the opening to the flue. Can I simply put the black stove pipe into the opening and seal around it with refractory cement? I may be able to expand the opening by 1/2 in. or so, to allow a slim thimble if necessary. Would you recommend this thimble, another type of thimble, or no thimble at all for my application, ? Can this galvanized metal be used safely as a thimble for a wood burning appliance?
By Brennan W. on December 14, 2016
Answer:For your installation, I would indeed suggest this thimble. It is safe to use when connecting stove pipe to a clay flue.
By Gary from Elmira, NY on October 29, 2012
Can I use this as a direct vent for my wood stove? Can I connect the 6-inch stovepipe from my stove directly to this and into my chimney?
By Collin C. - NFI Master Hearth Professional on October 30, 2012
Answer:This thimble is indeed designed for installation into a masonry chimney and will allow you to pass single wall stovepipe through the chimney and into the flue. You will need to use a fireplace cement or mortar to seal the small gap between the stovepipe and the thimble, as creosote leakage can occur otherwise.
By ray from pa on February 14, 2012
would you have the dimensions for the copperfield masonry 6" thimble such as (id,od and wall thickness)
By Collin C. - NFI Master Hearth Professional on February 15, 2012
Answer:Per the manufacturer, the measurements are as follows:
I. D. - 6 3/16"
O.D. - 6 1/4"
26 gauge galvanized steel.
By David from Baltimore Maryland on May 18, 2012
After i pass the thimble into the flue and cut it flush with the interior red brick is there anything to add to it before I put the inch pipe thru it and connect it to the stove, like a collar of some sort ?
By Collin C. - NFI Master Hearth Professional on May 18, 2012
Answer:You may choose to add a finishing collar around your stovepipe, in order to cover any potential gap between the pipe and the thimble. However, it may also be necessary to fill the gap with masonry cement or mortar, depending on whether or not your chimney is lined.
If the pipe is venting into an open chimney, you will definitely need to seal the gap with mortar, then cover it with a trim collar.