Patent ID: 8439732

Claim:
An HVAC module comprising: a housing; an air supply passage in the housing; a blower operable to supply an air flow to the air supply passage; an outlet passage in the housing; a conditioning passage in the housing in flow communication with the air supply passage and the outlet passage; a heat exchanger supported in the housing by a partition wall of the housing; an actively controlled door operable to selectively block flow communication between the air supply passage and the conditioning passage; and a passive air valve having an open position allowing air to flow through the conditioning passage and the heat exchanger when originating from the air supply passage and a closed position inhibiting air from flowing through the conditioning passage and the heat exchanger when originating from the outlet passage; wherein the passive air valve is in the open position during a heating mode of the HVAC module and is in the closed position during a cooling mode of the HVAC module.