[. . . ] Do not pick up anything that is burning or smoking, such as cigarettes, matches, or hot ashes. This machine is not suitable for picking up health endangering dust, unless all special authorized local/state federal precautions are complied with. Always turn off the vacuum cleaner before connecting or disconnecting motorized nozzle. [. . . ] A double insulated appliance is marked with one of the following: The words "DOUBLE INSULATION" or "DOUBLE INSULATED" or the double insulation symbol (square within a square). In a double-insulated appliance, two systems of insulation are provided instead of grounding. No grounding means is provided on a double-insulated appliance, nor should a means for grounding be added to the appliance. Servicing a doubleinsulated appliance requires extreme care and knowledge of the system, and should be done by qualified service personnel. Replacement parts for a double-insulated appliance must be identical to the parts they replace. Depending on the number of running hours ­ the dust filters should be replaced. the dust bag must be replaced at the same time the Main filter (sack filter) is replaced/cleaned. Keep the container clean with a dry cloth, and a small amount of spray polish. Any other servicing should be performed by an authorized service representative. If appliance is not working as it should, has been dropped, damaged, left outdoors or dropped into water, return it to a service center. While the machine is in use do not pull or carry by the cord, use cord as a handle, close a door on cord, or pull cord around sharp edges or corners. the size and quality of the dust bag and filters affect the machine efficiency. Use of non original dust bags or non original filters can cause restricted air flow which may lead to machine overload. This machine is equipped with a thermal cut-out to protect the motor and other vital machine parts from overheating. Should the machine cut out, you will have to wait at least 510 minutes for it to automatically reset. While you are waiting, switch the machine off and unplug it, then check the hose, dust bag and filters to be sure that nothing is blocking the flow of air through the machine. [. . . ] once the HEPA filter is removed (see Section 12 above) it is possible to inspect and replace the pre-filter if needed. Exhaust filter: This filter is used to clean the exhaust air coming from the motor. To replace exhaust filter: press down on the center tab of the exhaust cover and pull outward to remove the cover from machine. [. . . ]