All frozen food shall be held at an air temperature of 0°F or lower, except for defrost cycles, loading and unloading or for other temporary conditions beyond the immediate control of the person under whose care or supervision the frozen food is held. Only those frozen foods destined for further processing or repackaging in smaller units shall be defrosted for such purposes. All such defrosting shall be in accordance with good sanitary precautions.
7 Pa. Code § 37.2
This section cited in 7 Pa. Code § 37.3 (relating to internal product temperature); 7 Pa. Code § 37.181 (relating to acceptance of shipments); and 7 Pa. Code § 37.211 (relating to acceptance of products).