A permit is required for any air compressor that compresses non-flammable gas (including air) at pressures above 100 pounds per square inch (psi).
However, outdoor air compressing (other than a fair or festival) is not required a FDNY permit. The air compressor must be performed by or under the supervision of a person holding a Certificate of Fitness (A-35). This Certificate of Fitness is valid only for the specific person to whom it is issued and can be used anywhere within New York City.
NYC Fire Department (FDNY)
Public Certification Unit
9 MetroTech Center, 1st Floor
Phone: (718) 999-1988
Open Monday to Friday, 8:00 am to 2:30 pm. Closed on public holidays.
For further assistance, please call 311 and ask for: Certificate of Fitness