A dust vacuum collecting device is connected to an opening in the duct.It is recommended thatthe insulated area of the ductfor cleaning has a minimum static pressure of 25 mm c.a., to ensure correct transport of the material for collection.Compressed air is introduced into the ductwith a hose.The vacuum head is introduced into the ductusing the nearestopening atthe beginning of the duct network Hoovering is started, following the airflow, sufficiently slowly to allow the vacuum cleaner to gather all the dirt.
Mechanical brush method
A hoovering device is connected to the mostextreme pointof the network. Toevacuate dirtand dustparticles suspended in the air,rotary brushes are used, with electric or pneumatic power. Dirt particles are dragged into the airflow direction inside the ductand are then collected by vacuum cleaner.
Brushing operations will usually require larger access openings than the previous method.Nevertheless,fewer openings are needed.Certain types of mechanical brushes can reach up to 7min both directions.
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