Forced-air furnace (wood)
A wood forced-air furnace is a central heating appliance that burns cord wood to heat air and pushes it through the home's ductwork with a blower — the wood-fired equivalent of a conventional furnace, usually installed in a basement alongside or instead of a gas or oil unit.
Furnaces solve the wood stove's distribution problem: instead of one hot room and cool bedrooms, heat rides the ducts. Many are installed as add-on units sharing ductwork with an existing furnace, which also provides automatic backup.
Like room heaters, new wood furnaces must be EPA certified under the 2020 NSPS; certified models publish emission rates and efficiency figures in the same database as stoves.