| 摘要 |
PROBLEM TO BE SOLVED: To permit the omission of change of working, such as the shortening of an air supplying duct in accordance with the existence of mounting work of a muffler and the like. SOLUTION: An air passage A is defined and formed air-tightly in a casing 1 and a return-air port 25, provided on the upper surface of a third case 1c of the casing 1 is communicated with an air supplying port 15, provided on the upper surface of a first case 1a of the casing 1, through an air passage A. A heat exchanger 5 and a multi-blade fan 3 are arranged sequentially in the air passage A to constitute the air passage so that air, sucked through the return-air port 25, is discharged out of the air supplying port 15 through the heat exchanger 5 and the multi-blade fan 3 sequentially. The air passage A between the multi-blade fan 3 and the air supplying port 15 is provided with an installation space B for a muffler. |
