| The most important requirement for operating air-cooled compressors is an adequate flow of cooling air  C. The waste heat generated by the compressor must be reliably extracted at all times. There are three different possibilities for ventilation, depending on the rooms available, and the type and model of the compressor:
- Natural ventilation.
Ventilation through the air inlet and outlet apertures in the side walls or the ceiling by natural means i.e., without assistance from a ventilator.
- Artificial ventilation.
Ventilation through the air inlet and outlet apertures in
the side walls or the ceiling with the assistance of an outlet
ventilator.
- Air inlet and outlet ducts.
Ventilation by means of appropriate ducts, usually with the assistance of an exhaust ventilator.
- With water-cooled compressors the main heat is extracted by the cooling water. The residual heat (radiated from the motor) must be extracted by cooling air.
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