Filters for air extractor hoods; 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 filtration and purification units and replacement cartridges and filters therefor; Air filters for air conditioners in vehicle passenger compartments; Filters for air conditioning; Filters and filtering devices for air and gas conditioning; Air filtering installations; HEPA filters for household use; Fibrous filtering media for general industrial use in the purification of air and industrial fluids; Warming drawers for kitchens; Water filtration and purification units and replacement cartridges and filters therefor for refrigerators, ice makers; Air cleaning units containing an air filter, ultraviolet lights and a photocatalytic filter; Safety accessories for gas pipes, namely, flashback arrestors and reverse flow check valves; Air filters for air conditioning units; Air filtering units