C. Doctor india is an iso 9001: 2000 certified company manufacturing centrifugal fans, axial fans, jet fans, shell & tube heat exchangers, finned tube coolers & heaters, steam coil air preheaters etc. Dehumidifier is used to improve the air quality. It removes the moisture contents from the air reducing its relative humidity. Air to be dehumidified is sucked or forced through direct cooling coil using chilled water resulting in condensation of moisture contained in the air. The water droplets coalesce and get separated, collected, in the bottom tray and drains continuously. Outgoing dried air is heated, to maintain its desired process temperature through heater. It is widely used in drying systems, food processing industries etc.