What type of refrigerant requires FDNY approval?

Propane is considered a flammable refrigerant, and its use in commercial and industrial applications requires the approval of the FDNY. This is because propane can pose safety hazards, including the risk of fire and explosion, if not handled properly. Therefore, any system utilizing propane as a refrigerant must adhere to specific safety regulations outlined by the FDNY, ensuring that the systems are installed and maintained in a manner that minimizes the risk to public safety.

On the other hand, the other refrigerants listed, such as Freon (a brand name for a range of chlorofluorocarbons), Ammonia, and R-22, have different regulatory frameworks. Freon and R-22 are widely used but are not classified the same way as flammable refrigerants, so they do not require FDNY approval under the same guidelines as propane. Ammonia, while also having specific regulations, is primarily used in industrial applications and has a separate set of safety considerations. Therefore, propane stands out as the refrigerant that specifically requires FDNY approval due to its inherent risks.