1)reasonable structure,durable 2)low noise 3)energy-saving 6"8"10"12"Low noise Smoke Exhuast fan,plastic fan,square fan 1)reasonable ... structure,durable 2)low noise 3)energy-saving 6"8"10"12"Low noise Smoke Exhuast fan,plastic fan,square ... % copper wire motor 3. High quality PP & ABS material 4. Low noise & large airflow5.high intensity, long service life....6. Newly-developed ...