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A permit is required to store, handle or use compressed gases in quantities exceeding those set forth as follows:
| Type of Gas | Quantity (SCF) |
|---|---|
| Corrosive (e.g. ammonia) | 400 |
| Flammable (e.g. acetylene, propane) | 400 |
| Highly toxic | Any Quantity |
| Nonflammable and nonoxidizing, except carbon dioxide | 3,000 |
| Carbon dioxide | 4,500 |
| Oxidizing | 504 |
| Pyrophoric | Any Quantity |
| Toxic | Any Quantity |
| Unstable (reactive) | Any Quantity |
| Water reactive | Any Quantity |
For assistance with applying for and receiving Permits and Letters of Approval on FDNY Business, contact the FDNY Customer Service Center by dialing 311, or via email at FDNY.BusinessSupport@FDNY.nyc.gov.