... made of different materials. Nano-TiO2 photocatalyst uses UV light, sunlight or fluorescent light to excite the ... filters Product Features: 1. Widely Used, such as air purifier, air-conditioning system,car filter , waste gas treatment....etc. ... area: Photocatalytic filters are widely used in air-purifiers, air-conditioners, car air-purifying systems, workshop ventilators and industrial waste gas ...