ALEXANDRIA, Va., March 26 -- United States Patent no. 12,258,700, issued on March 25.
"Heat exchange exhaust system for clothes dryer" was invented by Doug Frost (Port Alberni, Canada).
According to the abstract* released by the U.S. Patent & Trademark Office: "A heat exchange exhaust system for a clothes dryer, comprising an inner exhaust air conduit, an outer air supply conduit concentric with and external to the inner exhaust air conduit; a plurality of radial fins for maintaining a volume between the inner exhaust conduit and the external supply conduit; sealing means for sealing the back perimeter of the clothes dryer to an adjacent wall; and an air supply plenum within the adjacent wall from which the inner exhaust air conduit and o...