International Mechanical Code Section 1104.4.1 is hereby amended to read as follows:

1104.4.1 Noncommunicating spaces. Where the refrigerant-containing parts of a system are located in one or more spaces that do not communicate through permanent openings with a minimum size of 100 square inches (645 sq. cm), or HVAC ducts, the volume of the smallest, enclosed occupied space shall be used to determine the permissible quantity of refrigerant in the system.