This part of GSO ISO 11602 gives requirements for the selection and installation of portable and wheeled fire extinguishers. It is intended as a companion to GSO ISO/TS 11602-2 . Portable fire extinguishers are a first line of defence against fires of limited size. They are needed even if the property is equipped with automatic sprinklers, standpipe and hose, or other fixed protection equipment . This part of GSO ISO 11602 is not applicable to permanently installed systems for fire extinguishment, even though portions of such systems may be portable (such as hose and nozzles attached to a fixed supply of extinguishing media). Its requirements are minimum requirements. The use of larger, higher-rated or greater numbers of extinguishers will, in general, improve protection . Extinguishers for use on board aircraft, watercraft and vehicles are outside the scope of GSO ISO 11602 .