The Numatic International range of HZ vacuum cleaners has been specifically designed to meet stringent requirements of industries where it is necessary to vacuum dusts that could constitute a health hazard. The total design concept has been to provide a series of vacuum cleaners that meet an absolute 99.95% filtration efficiency, coupled with practical engineering features that ensure that they can be easily and efficiently used and maintained on a day to day basis. The three small machines within the HZ range only vary in the container size and construction. The universal HZ power head is of all-steel construction and incorporates a full TwinFlo’ motor and the Nucable plugged cable system is standard. The HEPA filter unit is mounted in an all-steel secure module with a separate primary pre-filter filter in the container itself and all machines are designed to operate with HepaFlo dust bags to ensure easy, clean and safe emptying. All machines are supplied with comprehensive accessory kits including initial HepaFlo dust bags of the correct size. Correctly selected and maintained the HZ series will form a valuable part of any system designed to control hazardous and health endangering dusts in the environment but it is important to ensure the correct consideration is given to the appropriate clothing and protection required by the operator in carrying out any specialist operation. Note When using an ‘HZ’ machine to pick up health endangering dusts, it is important to ensure that correct consideration is given to the appropriate clothing and protection required for the operator.