1. No engry consumption.
2. Low noise, strong ventilation.
3. Environment friendly.
High ventilation efficiency.
No operation cost and environment-friendly.
Long service life and no need of maintenance.
Reliability service, convenient installation and no leakage.
Using the air flow between the indoor and outdoor to drive the turbine operating.
They can effectively exhaust the hot wet fan and grime air indoor out, and make fresh air entry on and on, to improve the air condition of the room.
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