*If there is a terra cotta clay flue liner, does it protrude out of
the top of the chimney at least 2 inches? If there are at least 2
inches and the terra cotta clay is in good condition, you will use
our stainless steel, terra cotta top plate that has a 1 1⁄2inch edge
that goes all the way around (like a shoebox lid).

*If your terra cotta clay flue is in bad shape at the top, you may
need to just take a hammer and tap all around that terra cotta,
taking it away to make the surface flat at the top of your chimney.
In that case, you will simply use the flat top plate that comes with
our liner kit.

*If it is on the back of the stove, is it parallel with the back of the stove or is it at an angle, like 45 degrees?

*If it is at an angle you will use an insert stove adaptor (an insert liner kit) rather than a two-part tee with cleanout cap.

Usually pellet stoves have an exhaust hole id of 3 inches. However, if you are going up more than 15 feet to the top of your chimney you need to use a pipe and/or flex liner that is 4 inches diameter.

If you are only venting a hot water heater then the exhaust hole diameter is probably 3 inch diameter. If it is 3 inch diameter and you are going up more than 15 feet to the top of your chimney, you must use a 4 inch diameter flexible liner or ridged pipe for proper draft. We also suggest to go ahead and use a 4 inch diameter flexible liner or ridged pipe even if the total length is 15 feet or less.