18. Axial Fan Types Based on Mounting: Wall, Duct, and Roof ConfigurationsAxial dc fans are categorized not only by their internal design (Propeller, Tubeaxial, Vaneaxial) but also by their mounting configuration, which determines their specific application environment[23]. The three most common types based on mounting are Wall-Mounted, Ducted (In-Line), and Roof-Mounted[13][18]. Wall-Mounted Axial Fans (often simple propeller fans) are installed directly into an opening in a wall or panel, such as an exterior wall or the side of an industrial enclosure[8]. They are used for general room exhaust or supply ventilation where air resistance is extremely low, providing rapid air exchange in warehouses, workshops, and paint booths[13][21]. Ducted Axial Fans (Tubeaxial and Vaneaxial fans) are designed with circular flanges and a rigid casing, allowing them to be installed directly into a section of cylindrical ductwork[13][23]. This configuration is mandatory for moving air over long distances or through complex ventilation systems[13]. Finally, Roof-Mounted axial fan odm Fans are specialized exhaust units installed on the rooftop of a building[18]. They are typically fitted with weather protection components, such as a rain cowl and weather flaps, to shield the motor and internal mechanics from environmental elements[18]. These fans often handle general building exhaust or specific fume removal and must be designed to withstand high winds and varying temperatures while efficiently discharging air vertically away from the building structure.
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