Air curtain system

Claim 1

An air curtain system comprising a room having an outer wall and a door opening therein, an air chamber intermediate said door opening and said room and having a floor, a ceiling, and a pair of side walls extending from the door opening into the room at right angles to the outer wall, and at least one blower unit adjacent one side wall of said air chamber, said blower unit extending in a horizontal direction substantially through the entire length of the air chamber and extending in a vertical direction substantially from the floor to the ceiling, and comprising an elongated cabinet of substantially rectangular cross section having bottom and top walls, a pair of side walls and a pair of end walls, cyclone means for developing a cyclone of air in said air chamber, said cyclone means comprising an air intake aperture in one of said side walls adjacent one of said end walls, and a pair of exhaust apertures in said side wall adjacent the other end wall, spaced in a horizontal direction from said intake aperture by a distance so that the air traveling from said exhaust apertures interacts with the air traveling to said intake aperture so as to form said cyclone of air therebetween, said apertures extending in the full height of the cabinet from the bottom wall to the top wall thereof, a partition in said cabinet intermediate said intake and exhaust apertures dividing the cavity of the cabinet into an air intake chamber and an exhaust chamber, an aperture in said partition, and a blower mounted on said partition adjacent the aperture therein.