(1) The impeller is generally multi-blade forward blade type, but the two end faces are closed.
(2) There is no limit to the width B of the impeller, when the width increases. The flow rate also increased.
(3) Unlike a centrifugal fan, the cross-flow fan not opened on the side plate of the casing to allow the airflow to enter the fan axially, but to partially open the casing so that the airflow enters the fan directly and radially. The air flow traverses the blade twice. Some cross-flow fans are equipped with immovable guide vanes on the inner edge of the impeller to improve the air flow.
(4) The air inlet and outlet are rectangular, which is easy to match with the building. The use of small cross-flow fans is steadily expanding.