Environmental control unit for hospital room

A self-contained, portable air conditioner and filtering unit for creating a positive pressure, negative pressure, or neutral pressure in a conditioned space;

• comprising a housing, a refrigeration circuit including a compressor, a condenser coil, and an evaporator coil;
• a common air intake plenum having a first return air inlet for admitting return air from the conditioned space into the plenum, a second return air inlet for admitting outside air into the plenum, and a supply duct connecting the second return air inlet to an air source outside the conditioned space;
• a supply air outlet for exhausting cleaned and conditioned air into the conditioned space;
• an exhaust air duct for exhausting condenser air to an outlet outside the conditioned space;
• an inside airpath within the housing and leading from said common intake plenum to said supply outlet, the inside air path including HEPA filter means for cleaning the air in the inside air path, said evaporator coil, and an evaporator fan for drawing the air through said HEPA filter means and said evaporator coil and for exhausting the cleaned and conditioned air through said supply air outlet into said conditioned space;
• a condenser air path leading from said common intake plenum to said second exhaust air duct, the condenser air path including HEPA filter means for cleaning the air in the condenser air path, said condenser coil, and a condenser fan for drawing the condenser air through the HEPA filter means of the condenser air path, and through the condenser coil, and forcing the condenser air into said exhaust air duct for conducting the condenser air outside the conditioned space;
• and means for selectively opening and closing air flow through the first and second return air inlets into the common intake plenum to create selectively an overpressure or an underpressure in the conditioned space.