| 摘要 |
An insect/dust-proof air shutter which can positively prevent intrusion of foreign mater such as insects and dust and further trap intruded insects is provided. The air shutter 1 has side casings 2, 3 between which a passage space S is formed through which an inside space of a room is communicated to an outside space, the side casing 2 has an air suction openings 21 and an air discharge opening 22 proximate horizontally to one another and opening toward the passage space S, the side casing 3 has an air suction opening 31 and an air discharge opening 32 proximate horizontally to one another and opening toward the passage space S, the suction openings 21, 31 face the discharge openings 32, 31 respectively across the passage space S, air passages 23, 24 are formed in each of the side casings 2, 3, air sucked through each of the suction openings 21, 31 is reversed in flow direction horizontally by 180° in each of the air passages 23, 24 to be blown out from each of the discharge openings 22, 32, and air streams blown out from the discharge openings and sucked through the suction openings form circulating air streams flowing laterally across the passage space thereby forming double air films covering the passage space S.
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