| 摘要 |
PROBLEM TO BE SOLVED: To obtain a metallic grease filter which makes it possible for a user to find the degree of contamination of the filter and to easily judge the exchange time of the filter. SOLUTION: A mark 15 of a noncombustible white inorg. material is fixed on the central position of the surface of a grease filter 10 comprising metallic porous bodies having a three-dimensional network structure. Since the white mark 15 of the grease filter 10 before use turns black by the sticking of oil mist after use, the exchange time of the grease filter 10 for washing can be judged. |
