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A FDNY permit is required when for Air compressor. - ANSWERSIf a compressor is used to compress any nonflammable, corrosive or oxidizing gas, including air to a pressure exceeding 100 psi. When is a permit not required fir air compressors? - ANSWERSOutdoor air compressing (other than a fair or festival) is not required a FDNY permit. Who issues the permits. - ANSWERSThere permits are issued by the bureau of Fire Prevention. What is an air compressor? - ANSWERSIt takes the air in a room ...