The Statherm heat recovery equipment on Chazelles fireplaces is designed to easy adaptation and installation in your fireplace. So there's no more wasted heat and you get a significant improvement in the yield of your open woodstove; thanks to the cast-iron exchanger you get more heat in the entire room.
How does it work?

Fresh air circulating from the back, crawl space or basement is heated as it rises through the cast-iron exchanger.

The hot air is then blown into the room through two grids in the fireplace hood..