HOT AIR CIRCULATION TYPE HEATER

PROBLEM TO BE SOLVED: To provide a hot air circulation type heater, which improves productivity and serviceability by decreasing the number of fastening screws for fitting a circulation fan case, and prevents oil component and smoke sucked in the circulation fan case from leaking out of a clearance gap between a rear plate of a heating chamber and the circulation fan case, or prevents leakage of high temperature air. SOLUTION: This hot air circulation type heater includes the circulation fan 15, the circulation fan case 16 and a holding fitting 21. A flange part 16a of the circulation fan case is inserted and held in a groove part 21a of the holding fitting, whereby the circulation fan case 16 is closely bonded to the rear plate 11a of the heating chamber to be held, so that the number of fastening screws 20 is decreased so as to improves productivity and serviceability. Further, oil component and smoke sucked in the circulation fan case 16 are prevented from leaking out of a joint part of the rear plate 11a of the heating chamber and the circulation fan case 16, and further leakage of high temperature air is also prevented. COPYRIGHT: (C)2003,JPO