this is a clayton by us stove company water less forced air outdoor wood and coal furnace hooks up directly to forced air heat systems was used for one year has shaker grates for coal or wood will heat up to 3,000 sq feet duct work is included furnace is still hooked to house and firing so I can show how it works and is hooked to the house can be unhooked in about 1-1/2 hours I can email more pics asking $2,100 OBO please call