An indirect waste receptor is installed to receive drainage from a commercial food waste grinder. According to Section 812.1, what is the minimum required air gap between the waste outlet and the flood level rim of the receptor, unless the waste is from a single fixture with an outlet not exceeding 1 inch in diameter?

• Equal to the diameter of the outlet.
• Twice the diameter of the outlet.
• One inch.
• An air break is permitted.