There will a Compressor in side the machine for compressing air a day send through the site beds to generate concentrated oxygen. While compressing heat will be generated and Compressor gets heat. So to reduce the temperature of Compressor a cooling fan was arranged to cooling. The coll air takes the heat and become hot air and goes out of the machine from bottom ventilation. If the hot air doesn’t come out the compresdor gets damaged .so the customer need not worry as it’s getting hot air. We have to worry only when the hot air is not coming. During summer patient feels it so keep better ventilation to the room. This is common for any concentrator.