Greenheck’s Vektor-H laboratory exhaust fans are now available with a reduced maintenance direct drive fan design for high efficiency operation, lower sound levels, and reduced long-term operating costs. The Vektor-H is a self-contained, high plume laboratory exhaust system designed to remove hazardous or noxious fumes from a laboratory, dilute the fumes with bypass air and expel them from the laboratory building to ensure safety on the roof deck and to prevent re-entrained fumes from entering building make-up air systems.