Dual stage air intake systems for the air intake of engines, ventilation systems and other apparatus that draw in air laden with debris consisting of two stages the first of which is comprised of a housing and impeller rotatably mounted within the housing for cleaning intake air by spinning the intake air at high speed to separate heavier-than-air contaminates there from by centrifugal force, with the impeller being driven by the air drawn into the system, the second stage being an evacuated vortex chamber

'air':3,8,20,47,52,61,75 'apparatus':16 'centrifug':66 'chamber':87 'clean':45 'compris':33 'consist':24 'contamin':62 'debri':23 'draw':18 'drawn':76 'driven':72 'dual':1 'engin':11 'evacu':85 'first':29 'forc':67 'heavier':59 'heavier-than-air':58 'high':54 'hous':36,43 'impel':38,70 'intak':4,9,46,51 'laden':21 'mount':40 'rotat':39 'second':81 'separ':57 'speed':55 'spin':49 'stage':2,27,82 'system':5,13,79 'two':26 'ventil':12 'vortex':86 'within':41

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