Filters for air extractor hoods; Industrial scrubbers for removing particulate matter from the air during industrial processing, namely, impingement scrubbers, venturi scrubbers, dynamic scrubbers; Filters and filtering devices for air and gas conditioning; Air purifying apparatus; Air filtering installations; Air filters for industrial installations; Air cleaning units containing an air filter, ultraviolet lights and a photocatalytic filter; Air filters for air conditioning units; Air filter...