The fixed ventilator is a product that does not have its own rotation, but can quickly exchange and circulate indoor and outdoor air. The working principle is that the indoor and outdoor temperature difference between indoor and outdoor makes the indoor air flow, hot air and moisture are discharged from the fixed ventilator, and the room always maintains fresh air. This product requires no energy consumption and is environmentally friendly. Suitable for stadiums, warehouses, factories, farmhouses, indoor parking lots and other environments. Because the fixed ventilator has no rotation, it is visually balanced, quiet, vibration-free, and has a long service life. This product is welcomed and chosen by designers and owners.