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SCHOFIELD, Wis. - The U.S. Patent and Trademark Office issued a patent to Green heck for a two-stage air purification system its engineers invented for installation and operation within a kitchen ventilation hood. The Grease Grabber(TM) (GG) multi-stage filtration system is available in Greenheck kitchen hoods. The system uses the Greenheck Grease-X-Tractor(TM) (GX) filter along with a secondary filter to remove 80 percent of the grease from the airstream.