I am considering purchasing an Enviro EF3 pellet insert. The dealer told me that he does all his installs with 3 inch exhaust liner, regardless of height. He says that a 4 inch liner creates draft problems on all pellet stoves. Most manufacturers recommend 4 inch liner for installs exceeding 15 feet. The EF3 manual just says to use 3 inch or 4 inch liner and does not mention height. The height of my install will be about 25 feet. Who's correct? The installer or the manufacturers?
3 inch or 4 inch exhaust liner?
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The particulars of an installation exactly like you are talking about are discussed in the last example at the bottom of the page here:
http://www.nevelsstoves.com/articles/Venting-your-pellet-stove.htm
Use four inch liner to reduce the frictional resistance of the liner to the positive exhaust pressure from the insert.
http://www.nevelsstoves.com/articles/Venting-your-pellet-stove.htm
Use four inch liner to reduce the frictional resistance of the liner to the positive exhaust pressure from the insert.
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