Airox Nigen Equipments Pvt. Ltd. Offers Heatless Type Desiccant Dryers. Airox Nigen Equipments Pvt. Ltd. Supplies adsorption based gas generators and air & gas drying equipments. Heatless Type Desiccant Dryers is a chemical desiccant using dryer, working on adsorption principle. Heatless Type Desiccant Dryers consists of twin towers filled with desiccant of appropriate quality and quantity. These dryers use a small proportion of the processed compressed air to reactivate the wet desiccant bed.