| 摘要 |
The grille consists of a first piece (A, A') provided with a ring-shaped body (1, 13) having a round or polygonal shape, equipped on its external front with a flange (3, 14) for the abutment against the wall (S), on which the air intake duct (C) opens, and provided with means for the fixing on said wall and/or on the duct. Said grille here referred to also consists of a second piece (B, B'), provided with a ring-shaped body with a round (9) or polygonal shape (23) to be introduced with a minimum clearance into the body (1, 13) of said first piece (A, A'), and equipped with a plurality of wings (10, 24) integral with it, distanced one from the other and suitably oriented. At least one net (6, 16) is placed between said two pieces, in order to prevent the transit of insects. Said second piece is kept within said first piece by means for the removable fixing, said means being prearranged so as to be easily operated by the user, so that by pressing them it is possible to remove said second piece (B, B') for the periodical cleaning of said net.
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