Abstract: A unit ventilator is described in which air treating apparatus is housed within a chassis which is readily removable from a fixedly installed cabinet. The air treating apparatus includes an evaporator, a compressor, a condenser and an air flow system for separately handling air for ventilating and air for condenser cooling and in which the system for condenser cooling provides for evaporative cooling of the refrigerant. The invention contemplates modular system arrangements in which the use of plural chassis in an installation enables the production of a wide range of ventilating capacity from minimal change in alternative chassis modules.

Abstract: A unit ventilator is disclosed wherein, in order to facilitate service and repair of the ventilator and/or its component parts, such parts are mounted for ease of access and of detachment from, or assembly to, the system. Elemental system parts, such as the blower assembly, the heat transfer coil assembly, the condensate discharge pan and the air filters are designed and arranged so as to be assembled and/or disassembled from the system rapidly and with minimum use of tools.