| 摘要 |
The present invention is to provide an apparatus to prevent back flow of a ventilating hole, comprising: a cover to cover the ventilating hole; a plurality of penetrating holes punched in the floor plate of the cover; a pair of valve combining holes punched in the floor plate and formed to be close to the penetrating holes; and a valve member combined with the valve combining holes to block the penetrating holes only in one direction. The valve member comprises: a sticking plate to cover and seal the penetrating holes; a combining unit to protrude on one side of the bottom surface of the sticking plate and to be inserted into and combined with the valve combining holes; a side surface plate protruding from one side of a side surface of the sticking plate upward; and a plurality of reinforcing rods extended from the side surface plate to support the sticking plate from the top. The apparatus of the present invention can be installed on a ventilating hole to open the ventilating hole when internal air is discharged to the outside, to effectively block when external air flows in, and to minimize waste of energy. |
