Patent ID: 7195672

Claim:
In a working post with air circulation comprising an airflow generator which is connected to a plenum roof and a hollow floor, a working area being the space between said hollow floor and said plenum roof, the improvement comprises: a. an airflow generator comprising: (1) three compartments, wherein a first compartment is connected to a second compartment and to said plenum roof, said second compartment leads outside said airflow generator and is connected to said first compartment and to a third compartment, said third compartment leads outside said airflow generator and is connected to said hollow floor and to said second compartment, (2) two fans, wherein said first fan is positioned inside said connection of said first compartment and said second compartment, and said second fan is positioned inside said third compartment, (3) one motor that simultaneously powers said first fan and said second fan and is positioned in between said first fan and said second fan, (4) three airlocks, wherein a first airlock is positioned on top of said second compartment, a second airlock is positioned on top of said third compartment, a third airlock that is positioned inside said connection of said second compartment and said third compartment, (5) one gear motor that simultaneously operates said first airlock and said second airlock, b. a plenum roof that is connected to and supported by said airflow generator, containing inside its hollow part at least one source of light, and having a filter means as its lower surface, c. an air filtering hollow floor comprising a plurality of elongated tubular pieces positioned beside each other perpendicularly to said airflow generator, each of them having a perforated upper surface and, an open end on the side of said airflow generator and a dosed end on the opposite side.