| 摘要 |
PROBLEM TO BE SOLVED: To provide a differential pressure type natural air supply port capable of shutting off an invasion of an outdoor wind and a noise by assuring a supply air flow rate of a maximum limit even in the case of small differential pressure between an indoor and an outdoor. SOLUTION: The differential pressure type natural air supply port comprises a shutter 3 rotatably supported to a cylinder 2 fixed to an opening provided at an outer wall 1 to open or close the cylinder 2, and a coupling bar 5 for cooperatively coupling the shutter 3 with protrusions 4 at two positions on a lower part. In this case, the protrusions 4 are vertically arranged so that, when the bar 5 is moved up at a stroke necessary to rotate the shutter 3 to a full opening in the state that a lever 9 is disposed at a center, a lower part protrusion 4b of the bar 5 is brought into contact with a lower end of a protrusion 8 of the lever 9 and an upper part protrusion 4a is brought into contact with an upper end of the protrusion 8. Accordingly, even if a differential pressure between an indoor and an outdoor is low, a supply air flow rate of a maximum limit is assured, and hence an invasion of an outdoor wind and a noise can be shut off.
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