Air cleaning systems, namely, air intake systems being engine parts for cleaning debris laden air entering engines that draw in air laden with debris, comprising a housing and an impeller rotatably mounted within the housing for cleaning intake air by spinning the intake air at high speed to separate heavier-than-air contaminants therefrom by centrifugal force, the air intake systems including passive systems wherein the impeller is driven by the air drawn into the system and motor-driven impeller systems wherein a motor of the system rotates the impeller, and the systems having one or more stages for separating and removing particles of debris from the air flow

Air cleaning systems, namely, air intake systems for cleaning debris laden air entering ventilation systems and other apparatus that draw in air laden with debris, comprising a housing and an impeller rotatably mounted within the housing for cleaning intake air by spinning the intake air at high speed to separate heavier-than-air contaminants therefrom by centrifugal force, the air intake systems including passive systems wherein the impeller is driven by the air drawn into the system and motor-driven impeller systems wherein a motor of the system rotates the impeller, and the systems having one or more stages for separating and removing particles of debris from the air flow [; and fluid purification units for commercial and industrial use for the purification of fluids, namely, hydraulic fluids, turbine oil, lubricating oil, cleaning fluids, liquid filters, and cutting oils to remove solid contaminants, water, acids, semi-solids, asphaultants,chlorides (NaCI), salts, ammonia and other volatile contaminants from the oil or fluid ]