PURPOSE:To mount the hood properly by installing a supporter with a plurality of mounting positions in the hood and setting up a blowing device to either of exhaust ports in response to the height of an exhaust port. CONSTITUTION:Mounting members 7c, 7d and 7g, 7h are set up on the upper side and said members 7a, 7b and 7e, 7f on the lower side respectively on the inside of a hood proper 2, and a supporter 6 is formed by the said members and supporting members 8, 8. The legs 20 of a blasting device 11 are mounted to the mounting members 7c, 7d, 7g, 7h through the supporting members 8, 8 when the height of the exhaust port B of a chamber wall A is high and to the members 7a, 7b, 7e, 7f when the height is low in response to the height. Accordingly, a hood 1 can be installed at proper height, and oil mist, etc. rising from a range (not shown) can be collected excellently.
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