Guardian G500BOperation: Electronic Coverage: Gas Ranges up to 42” wide x 24” deep or 1,008 sqi. Gas Ranges 36” wide x 24” deep or 864 sqi. Hood: Any standard residential hood with a single light and fan in the center that meets the same range size requirements. The bottom of the hood must have a minimum height of 18” to the range and cannot exceed 30”. Circuit Board: New and improved circuit board with plug and play features.