VENTILATION DAMPER SHIP AND OPENING AND CLOSING METHOD OF VENTILATION DAMPER

摘要

The ventilator includes a normal ventilator main body 15, a lid portion 16 for closing the opening of the ventilating lid main body 15 and an opening and closing device 17 for opening and closing the lid portion 16, The apparatus 17 includes a main arm 21 mounted on a central portion C of the lid portion 16 and extending outwardly of the ventilating main body 15 when viewed in a plan view, A lower arm 22 mounted on the lid portion 16 on the outer side of the central portion C and extending in the same direction as the main arm 21 in a plan view, A support portion 23 having a support main body portion 42 for supporting the main arm 21 and the subsidiary arm 22 so as to be rotatable in the main arm 21 and the support portion 23, And a driving unit 24 that applies a driving force to the driving unit.