My Heatilator is useless for heating so I want to install an insert and use existing chimney. I have a small wood stove (Vogelzang BX26E - firebox is ~ 12"Wx24"Lx14"H) and want to know if I can run a 6" stainless steel liner up the 8" flue to top of chimney. The current flue pipe is probably double wall with 10" outer. Only the back of the stove would be in the existing firebox. Specs call for 36" clearance for the stove, but the Heatilator has double wall sides with bricks in back.