dust extraction installations (ventilation); apparatus for collecting dust from the air; air filters for use as dust extractors; dust removing installations for ventilation; dust cyclone filters; filters for dust; dust filters; dust exhausters; installations for dust separating; electrically powered blowers for dust extraction from the air; apparatus for exhausting dust (ventilation); apparatus for filtering dust; dust suction installations for industrial purposes; apparatus for extracting dust (ventilation); dirt pans (parts of fires or furnaces); installations for the collection of liquids; portable filtration units (other than machines); portable filtration apparatus for filtering air (other than machines); apparatus for exhausting mists (ventilation); apparatus for exhausting fumes (ventilation); apparatus for exhausting gases (ventilation); apparatus for exhausting particles (ventilation); fume exhausting hoods; air cleaning filters (parts of air cleaning machines or installations); portable filtration apparatus for filtering water (other than machines); air filtration installations; water filtration apparatus; water filtration installations; installations for water filtration; air purification apparatus for clean air cabinets; electrostatic precipitation apparatus for cleaning air; air purification machines; filter boxes for water purification; industrial installations for filtering liquids; water purification machines; cartridges for filtering water in steam irons; filtration apparatus for industrial purposes; oil vapour extraction installations; apparatus for extracting particles (ventilation); apparatus for extracting fumes (ventilation); apparatus for extracting mists (ventilation); installations for air extraction