Except as otherwise specifically provided in this section, it shall be unlawful to install, alter or extend a refrigerating system without first having obtained a permit therefor from the Commissioner. No permit shall be required for emergency or general service repairs which require no permanent change in the equipment nor for a unit system containing a maximum of 20 pounds of refrigerant nor for a noncondensing refrigerating system using air as a refrigerant.
It shall be unlawful to use or permit the use of any such refrigerating system until the Fire Commissioner has approved the same as meeting the requirements of the New York Uniform Code.