Patent ID: 6918598

Claim:
An energy recovery unit for extracting heat from exhaust gases in an exhaust duct having an inner surface, said energy recovery unit comprising: a heat exchanger disposed in said exhaust duct, said heat exchanger for extracting heat from said exhaust gases, an outer surface of said heat exchanger and said inner surface of said exhaust duct defining a clearance therebetween; a hot air sealing arrangement for sealing between said outer surface of said heat exchanger and said inner surface of said exhaust duct, said hot air sealing arrangement including: an inner receiver attached to said outer surface of said heat exchanger; an outer receiver attached to said inner surface of said exhaust duct; and a seal having an outer bead engaged with said outer receiver for rotary movement therein and an inner bead engaged with said inner receiver for sliding movement therein, said seal further including a connecting sheet between said outer bead and said inner bead, said connecting sheet having an inner portion inclined at a small angle relative to a tangent to said heat exchanger at said inner bead, and an outer portion that is shorter than said inner portion.