Air cleaning filters (parts of air cleaning machines or installations); air conditioning filters; air filter installations; air filtering apparatus; air filtering installations; apparatus for filtering breathing air; apparatus for filtering dust; apparatus for filtering fumes; apparatus for filtering gases; apparatus for the filtering of organic matter; bag filters; electrostatic air filters; filter bags; filter screens (parts of household or industrial installations); filtering apparatus (industrial) incorporating filter cartridges; filtering apparatus (medical) incorporating compound filter membranes; filtering apparatus (medical) incorporating particulate filter bodies; filtering apparatus (scientific) incorporating filter cartridges; filtering installations for air; filtering installations for flue gases; filtering screens (parts of household or industrial installations; filters (parts of household or industrial installations); filters being parts of industrial apparatus; filters being parts of industrial installations; filters being pneumatically powered; 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); portable filtration apparatus for filtering air (other than machines); power filters for air-conditioning