| 摘要 |
<p>The present invention relates to a ventilation fan capable of rapidly purify indoor air by forcibly discharging the indoor air and, more specifically, to a ventilation fan capable of preventing air backflow and incoming harmful insects. The ventilation fan has a flame resistant fabric unit which is installed on the outside bracket of a ventilator, and the flame resistant fabric unit billows since the air is discharged to the outside when ventilation operation is turned on. The flame resistant fabric unit contracts and blocks the bracket in order to prevent general outdoor air from flowing in the indoor space and prevent incoming harmful insects when ventilation operation is turned off. Therefore, the ventilation fan capable of preventing air backflow and incoming harmful insects may provide a pleasant indoor environment.</p> |
