Every year thousands of restaurant grease fires are reported, with the total cost of property losses approaching $100 million! Exhaust grease fires can only happen if fuel (grease) and flame or intense heat are brought together. The first line of defense is to have your exhaust system free of greasy build-up. This means keeping the hoods, ducts and exhaust fans in your kitchen free from obstruction with a professional cleaning by Georgia Vent Works.