smoke and fire escape mask

portable bag-like breathing apparatus inflatable with ambient respiratory air for non-medical use

A SELF-CONTAINED BREATHING APPARATUS, INCLUDING A GAS CYLINDER CONTAIN ING BREATHING GAS, A VALVE FOR RELEASING THEGAS, A HOOD FOR COVERING ONE'S HEAD, ANDA TUBE FROM THE CYLINDER TO THE HOOD FORFEEDING GAS FROM THE VALVE TO THE HOOD TO PROVIDE BREATHING GAS