Heat recovery unit for stoves

A heat recovery unit for stoves having an outlet for flue gases and smoke and associated with a chimney, comprising

• a casing having opposite ends and a bottom opening arranged to be connected to the outlet of a stove and a top opening arranged to be connected to a chimney,
• a plurality of upright panel-type compartments in said casing having defining walls and opposite ends and disposed in spaced relation for allowing flue gases and smoke to travel through the casing in the spaces between said compartments to heat the walls of said compartments,
• inlet means adjacent the bottom of said compartments and outlet means adjacent the top of said compartments,
• blower means arranged to force air to be warmed through said compartments,
• a cross shaft mounted in said casing adjacent the top thereof and above said compartments,
• said cross shaft extending across the spaces between said compartments and being disposed approximately centrally between the ends of said casing,
• operating means on said shaft exterior of said casing for rotating it back and forth,
• a single depending lever on said cross shaft for each space,
• said levers being secured on said cross shaft in vertical alignment with said respective spaces,
• and chains suspended freely from said levers having free ends extending to the bottom of said compartments and swinging loosely in the spaces between said compartments when said shaft is rotated back and forth to knock of soot and creosote from the walls of said compartments,
• said levers being of a sufficient length such that said chains in their swinging movement also engage the end walls of said spaces.