The G2 Grease Guard XD Rooftop Defense System was invented in 1989 and is the leading choice of rooftop grease containment systems, protecting the roofs on restaurant, property developers, food processing and industrial manufacturing facilities nationwide. All of our products are assembled in Naperville, IL with only suppliers of raw materials from the USA. The patented product contains a proprietary filter system, is UL listed and is available to ship within 24 hours in most instances. The Grease Guard Rooftop Defense System is the most comprehensive rooftop grease containment system on the market and is installed on over 20,000 rooftops nationwide.