Refrigeration systems, including storage tanks used in refrigeration systems, that use one of the following categories of refrigerant are permitted by rule: (1) simple asphyxiants limited to argon, carbon dioxide, ethane, helium, hydrogen, methane, neon, nitrogen, propane, propylene, or liquefied natural gas; or (2) any other chemical, excluding anhydrous ammonia, with a short-term effects screening level (ESL) published in the commission's ESL list greater than 150 µg/m3 ; (3) anhydrous ammonia (ammonia) provided: (A) the facility is registered with the commission's Office of Permitting, Remediation, and Registration in Austin using Form PI-7; and (B) the system is maintained in good working order and such that ammonia leaks are not detectable beyond the operator's property line.