Hi Anybody have the size of the rough opening for a Trillum
propane furnace? I measured my cupboard opening and it's 14 x 13 or so. I have a larger
furnace 14x17 I can use but don't want to cut anything before I'm sure I can install it easily ! I believe I read that the original one was a Duotherm make . Are there other makes that will fit ? Duane