Abstract: An air gun adapted to deliver a directed stream of high pressure air for cleaning and which is characterized by the ability to transmit the compressed air during normal operation with negligible loss of air pressure between that admitted and that released. The air gun includes a safety nozzle which comprises a flow tube, through which the pressurized air flows during normal operation, and a surrounding sleeve that extends outwardly beyond the outlet end of the flow tube and terminates closely adjacent thereto so as to serve to protect against blockage or stoppage of the outlet end. The sleeve also includes exhaust apertures closely adjacent the outlet end so that in the event the discharge end of the sleeve is blocked or obstructed, the pressurized air will be released through the exhaust apertures and the air pressure at the discharge end significantly reduced.