PURPOSE: To reduce noise of an entire blower by forming a plurality of grill sash bars by filling submolded part in a groove of a main molded part and increasing a thickness without generating a recess on a surface of the grill in the safety grill arranged in a blowing air diffuser.
CONSTITUTION: A grill for a blower is disposed in a blowing air diffuser to obtain security by surrounding a supply fan and a duct. The grill is formed by mounting a plurality of grill sash bars 1 of an elliptical section made of thermoplastic synthetic resin at a predetermined interval at a vertical sash bar 2. In this case, the bars 1 are formed of both main and submolded parts 3, 4, and the submolded part 4 is filled in a groove 3a formed in a mold removing direction of molds of the part 3. Thus, the grill can be increased in thickness without generating a recess (shrinkage) on the surface of the bar 1. Accordingly, since a pitch is increased to reduce number of sound sources, noise of entire blower is decreased.
SUGIO TAKASHI
IZUMI YOSHIKI
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