Patent ID: 7251953

Claim:
A self-contained air conditioner and filtering unit for creating a positive pressure or a negative pressure in a conditioned space, comprising a housing; a refrigeration circuit comprising a compressor, a condenser coil, and an evaporator coil; a condenser side including an inlet port in said housing, an air path through said condenser coil, an exhaust outlet port in said housing, and a condenser fan forcing air through said condenser to said outlet; a conditioned air circuit including a return air intake on said housing leading into a return plenum, an air path passing through said plenum, past a HEPA filter and through said evaporator coil and a heating coil to a supply air plenum, and an evaporator fan moving said air through said evaporator coil to said plenum and out a supply duct to the conditioned space; a bypass plenum with openings communicating with the condenser side, the return plenum, and the supply plenum, and a slide baffle within said bypass plenum having first and second air openings therein in which in a neutral position, both the supply port and the return port are blocked so no air flows between the supply or return plenums and the bypass plenum, in a positive pressure position, the return port is opened but the supply port is blocked, and in a negative pressure position, the supply port is opened but the return port is blocked.