I'll be honest I hadn't really thought about multi-fuel before and as such never really learned the difference between pellet only vent and multi-fuel vent. I have no problems using pellet only if that ok as long as I keep it clean, but as I plan on selling the house potentially in the next couple years, what happens when the new residents don't practice the same burning principles and god forbid something happens and I am the one that installed the not-to-spec vent? Even though I got a bunch of elbows, adjustable length pieces, and probably 20 foot of pipe, its still only like $300 worth of venting if memory serves, not going to go broke if I have to replace it. Maybe I could rig it up in the garage or basement if I decide to put the current burner out there. But I doubt I'll find a great deal on something really good, so I'll likely keep what I got.