Ventilator type WPS-40 is advised to provide grain aeration because of its high compression (Max. 4000 Pa). Main parts of fan type WPS-40 like rotor, body, base of driving section made of carbonated steel with regular quality. Fan is driven by induction motor with frame shaped rotor. 3 phases of electricity power needed. Anticorrosive protection done by multipurpose use paint cover. Advised to silos type BIN500, BIN1000.