Stop! Measure the circumference; don't guess on the diameter!!

Please be sure to measure the circumference (distance around) your stove pipe. This is different from the diameter. See the instructions for help.

* Copper has about twice the thermal conductivity as aluminum.

Common metals ranked by thermal conductivity

Rank Metal Thermal Conductivity [BTU/(hr/ftâ‹…/F)
1 Copper 223
2 Aluminum 118
3 Brass 64
4 Steel 17
5 Bronze 15


Aluminum 3 Inch Aluminum 4 Inch Aluminum 6 Inch


Copper 4 Inch Copper 8 Inch Copper top view