Patent ID: 6884160

Claim:
A barrier apparatus for resisting passage of harmful gases from a space through a substantially vertical opening having a top, a bottom and lateral sides, the barrier apparatus comprising a suction arrangement for sucking gases and blowing arrangement for creating a flow of a medium, wherein the suction arrangement comprises at least one suction port ( 1 , 1 ′) located near the top of the opening to provide suction substantially along the width of the opening, the blowing arrangement comprises at least one blowing port ( 5 , 5 ′) located near the bottom of the opening to provide blowing substantially along the width of the opening, and a fluid coupling ( 8 , 9 , 8 ′, 9 ′) coupled between the suction arrangement and the blowing arrangement being provided and defining a fluid path between the suction port ( 1 , 1 ′) and the blowing port ( 5 , 5 ′), a spraying device ( 3 , 3 ′) being arranged in the fluid path for driving gas from the suction port to the blowing port and being arranged for spraying a liquid in the fluid path for purifying and/or cooling media flowing through the fluid path.