Abstract: An air curtain generator includes a casing with a fan received therein so as to blow an air curtain from opening of the casing. Two arms are pivotally connected to two end members on two ends of the casing. and each arm is pivotally connected to a fixed member. A link is pivotally connected between the fixed member and the end member so that the casing is able to be adjusted by pivoting the arms. The air curtain separates the workers and the source where generates contaminated air.