Self-hanging louver tuyere

1. Used for automatic exhaust in air-conditioned rooms with positive pressure 2. Can be used for new return air outlets and exhaust outlets 3. The louvers naturally sag by the air vents to isolate indoor and outdoor air exchanges, when the indoor air pressure is greater than outdoor, the airflow blows the louvers toward External exhaust, outdoor air can not flow into the room 4. This tuyere has a one-way check function 4. The shape can be...