Axial fans date back to the horizontally configured windmills of Europe in the Middle Ages. Axial fans adhere closely to classical theory and require less “know-how” than centrifugal fans. A centrifugal fan redirects the airflow perpendicular to the axis of rotation of the fan instead of just passing it through from one side to the other along the axis. A normal axial flow fan, whilst being very economical and compact, imparts motion to the air in an axial and rotational direction. Centrifugal fans - direction of rotation explained by Henk de Swardt, Marthinusen & Coutts directional fan with straight blades. They are bent in a specific direction. The propellers (fan blades) located in the circular flow path between the cylindrical hub and casing are used to force-feed air in order to generate air flow in the direction of the axis of rotation. On single inlet fans, drive side is always considered as the side opposite fan inlet (even when driven through fan inlet). Six different fans were tested to conclude what rotation was best for winter or summer. The axial load of an object is responsible for the force which passes through the center of the object, is parallel to its axis of rotation, and perpendicular to the plane of cross-section. The rotating component is usually called ‘swirl’. 4. The force owing to the axial load acts on the central axis of the object, and it can be a compressing or stretching force. Direction of rotation is determined from drive side of fan (see Note 2 and 3). They may be placed in three general classifications according to how the flow is constrained: • Ducted fan where the air has to flow through a duct thus encouraging it to enter and leave the impeller in an almost axial direction. • Axial fans are named for the direction of the airflow they create. They look like this . 2. If, when looking at the rotor housing of the axial fan, the air blows towards you, this direction of air flow is given the designation "A" (otherwise "V"). Common fan types: centrifugal (“squirrel cage”), axial, special designs (including radial) Fan rotation direction (clockwise or counterclockwise) is important because the blades and housing are designed to direct flow only in one direction Pressure drop through the system must be known to choose a fan. The first electrically powered fans, introduced in the 1880s, were axial fans. The blades of the fan are not perfectly plane. Using these fans in the opposite direction from that shown here will Axial Fans. 1. All fans had the same blade angle and the two settings operated the same way. Rotation Tests and Proved Results . Axial fans Impellers HyBlade Unique hybrid structure, combination of aluminum base material and glass-fiber reinforced plastic … By comparison, a centrifugal or radial flow fan moves air perpendicular to the axis of rotation. In these examples, the correct direction of rotation is clockwise as viewing the fans from the inlet side (as shown currently in the Figs). Since air flows along the axis of rotation, the structure is kept compact. A reader in Japan also conducted the following physical test and we compared notes. AXIAL FLOW FANS 1.0 Definition of Axial Fans An axial flow fan moves air or gas parallel to the axis of rotation. 3. On double inlet fans with drives on both sides, drive side is that with the higher powered drive unit. In these fans, the orientation of the blades (how they’re pitched) won’t affect the direction of the airflow. 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