Maybe I just don't understand someting about the question, but how's this related to gardening?

Maybe tgray raises his or her fire wood in the garden.
My garden has weeds big enough to make firewood. When
the wife forgets to chop them down.
Norm

Really big privet hedge makes long burning firewood, and anyone who wants some is welcome to come out and cut their own.
I expect tgray came here in hopes of a local answer, fair enough!
(Ashes as fertilizer also are a ON topic tie in.)
Not every blower will fit every insert, so you'll need to have a sketch with dimensions of any potential air circulation spaces.
In Knoxville there are two resources; the more knowledgeable is on Old Broadway and they sell a lot of different kinds of inserts and are more likely to be able to help you. The second is west, on Kingston Pike, just up from the Home Depot and they sell a lot of pretty woodstoves. We have two Dutchwest woodstoves and got the blower for the second one from them; the salesman didn't want to sell us the blower because he didn't think most folks who bought the stoves used them for heating, just as decorator accents. After that bit of ignorance, if there had been another local source, we would have walked out the door.
Almost felt like going to some nurseries.
Ann