Working principle

Place conditions: There are three types of ventilation methods for ventilation fans: exhaust type, suction type, and combined type. The exhaust type enters the air from the natural air inlet and expels dirty air through a ventilation fan; The suction type sucks in fresh air through a ventilation fan and expels dirty air from the natural exhaust outlet; The combination method is that both suction and exhaust are completed by a ventilation fan. A type of air conditioning appliance that is driven by an electric motor to rotate the fan blades and drive the airflow, enabling the exchange of indoor and outdoor air. Also known as a ventilation fan. The purpose of air exchange is to remove indoor dirty air, regulate temperature, humidity, and sensory effects. Ventilation fans are widely used in homes and public places. The amount and frequency of air changes required vary in different locations. The amount of fresh air required for a person or per square meter is called the required air exchange rate. The number of times fresh air is changed within one hour is called the number of air changes (see table). Structural ventilation fan, louvered ventilation fan, is the most widely used ventilation fan, mainly composed of auxiliary components such as electric motors, fan blades, wind frames, panels, louvers, and specialized pull switches. Electric motors generally use single-phase capacitor operated asynchronous motors. Ventilation fans with a size of less than 150mm also use a covered pole motor. Fan blades are generally injection molded with ABS and AS plastic, with light weight and high strength. The wind frame is usually made of thin steel plate stamping and spot welding, and plastic injection molding is also used. The panel adopts plastic injection molding. Louvers are usually stamped with thin steel plates or tinplate. The specifications of ventilation fans are divided into 100, 150, 200, 250, 300, 350, 400, 450, and 500mm based on their blade diameters. Connection related to the diagram