Patent ID: 7090000

Claim:
A heat recovery ventilator comprising: a heat exchanger having discrete inlet and exhaust passageways extending therethrough for providing heat transfer between respective fluids flowing along said inlet and said exhaust passageways; said inlet passageway providing fluid communication between a supply inlet plenum and a supply discharge plenum having a supply discharge port for discharging supply air; said exhaust passageway providing fluid communication between an exhaust inlet plenum having an exhaust inlet port and an exhaust discharge plenum; said supply inlet plenum having a supply port for admitting supply air into said supply inlet plenum; said exhaust discharge plenum having an exhaust port for discharging exhaust air from said exhaust discharge plenum; a transfer port between said supply inlet plenum and said exhaust discharge plenum for selectively providing fluid communication therebetween; and, a flow diverter associated with said transfer port and movable between a venting configuration in which said flow diverter covers and closes said transfer port and opens and allows fluid flow through said exhaust discharge port and a defrost configuration in which said flow diverter covers and closes said exhaust discharge port and opens and allows fluid flow through said transfer port.