Heatless Desiccant Air Dyer operates on two vessels one for drying and in the other the moisture absorbed by the adsorbent in the vessel is being regenerated. The Desiccant Air Dyer uses activated alumina or molecular sieve as desiccant for working at a flow rate of 5 CFM to 500 CFM. The Desiccant Air Dyer is capable of performing under pressure ranging up to 40kg/cm. The Heatless Desiccant Air Dyer comes in fully automatic version and can be mounted on wall.