The system is intended for industrial or medical applications to improve user comfort over a long duration by reducing inhale and exhale resistance. This is achieved by measuring the mask pressure through the use of a differential pressure sensor and using the analogue signal to directly adjust the speed of the brushless electric ducted fan to maintain positive pressure. This reduces the chances of inhaling particles through mask leaks and increases mask comfort by reducing breathing resistance. Air is fed to the mask from the back of the head via an FDM 3D printed flexible tube. The filters, motor and control circuitry are mounted on the back of the wearer’s head for improved ergonomics. To power the system a belt mounted Lithium-ion battery pack was made with 12 ‘18650’ cells.
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