An improved drier useful for drying wet materials, which comprises a drying chamber (1) having closed top and open bottom, conventional means (2,3) selected from hook hanger or perforated trays, being provided for holding , hanging or keeping material to be dried at the top of the said chamber(l), characterised the said chamber is being surrounded and enclosed by an inverted one side open insulated chamber (10) so as to leaving space for a duct (7) for directing hot air to upper zone of the dryer, an insulated moveable partition (11) has been provided between the said chamber(l) and duct (7) so as to form an air inlet (8) for transferring hot air from the said duct (7) to chamber(l), a heat source (5) being provided at the lower end (6) of the said duct (7), a closing mean such as herein described being provided at the said lower end (6) for controlling the air flow