Filter cartridges for industrial dust collection systems for use in pulse-jet cleaning; Filters and filtering devices for air and gas conditioning; Filters for air conditioning; Filters for air extractor hoods; Filters for drinking water; Air filtering installations; Air filtering units; Air filters for air conditioning units; Air filters for domestic use; Air filters for heating and cooling registers; Air filters for industrial installations; Air cleaning units containing an air filter, ultraviolet lights and a photocatalytic filter; Apparatus for filtering drinking water; Fibrous filtering media for general industrial use in the purification of air and industrial fluids; HEPA filters for household use; Industrial air filter machines; Rooftop grease containment system comprising an exhaust fan, grease deflector, and filter for trapping grease vented from rooftop exhaust fans for cooking areas within the building; Water filters; Water filtration and purification units and replacement cartridges and filters therefor