US Patent 7565773 Hazardous material storage building

A hazardous material storage facility is provided that includes an upper floor having openings therethrough, a lower floor that is sloped from an upper end to an elongated basin, at least one vent duct disposed beneath the upper floor and adjacent to the lower floor basin, the vent duct including vent openings structured to allow air and fumes to be introduced into the vent duct and a means for removing the air and fumes in the vent duct therefrom. In this configuration, air is drawn generally downwardly through the facility while hazardous vapors, which typically emanates from spilled hazardous materials on the lower floor, are located close to the vent duct.