Air filter installations; Air filtering apparatus; Air filtering installations; Air filters for use as dust extractors; Electrostatic air filters; Adjustable coated baffle grease filters (parts of cooker hoods); Air cleaning filters (parts of air cleaning machines or installations); Air conditioning filters; Apparatus for filtering breathing air; Apparatus for filtering dust; Apparatus for filtering fumes; Apparatus for filtering gases; Bag filters; Dust filters; Filter bags; Filter housings (parts of household or industrial installations); Filtering installations (household or industrial); Filtering installations for air; Filtering installations for flue gases; Filters being parts of domestic installations; Filters being parts of household installations; Filters being parts of industrial apparatus; Filters being parts of industrial installations; Filters for air conditioning; Filters for air extractor hoods; Filters for cleaning air; Filters for cleaning gases (parts of household or industrial installations); Filters for dust; Filters for exhaust extractors (parts of household or industrial installations); Filters for fume extractors; Filters for gas extractors; Filters for gases (household or industrial installations); Filters for industrial installations; Filters for use with apparatus for air conditioning; Filters for use with apparatus for ventilating; Filters for waste gas purification; Grease filters (parts of extractor fans); Installations for filtering the atmosphere; Portable filtration apparatus for filtering air (other than machines)