Instruction manualNegative Pressure Unit D-rangePage 298.3 Change of filterAttention: Contaminated filters have to be changed under all corresponding safetymeasures Filter change only with a machine switched off Use approved filters only Do not use bonding agents on the machineRemove the hepa-filter: Remove the prefilter Unscrew the hexagone screws M8 and remove the tension frame Remove the hepafilter and dispose of it professionallyInsertion of the hepa-filter: Control the sealing face of the machine and clean. Clean the inside of the housingI Insert the new filter in the middle Tighten the tension frame and the hexagone screws M8 (tighten the screws carefully) Insert the pre-filterImportant:Treat the hepafilter with care because otherwise damages can suspend theeffectivity of the filtration.