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What Is Filter BoxAir Filter Box playing main position in air purification of ventilation system,such as ductwork,indoor air formulation works as a purifier in air flow system, advantages from internal filters adding prefilter, cabon clear out and Hepa clear out Prefilter will catach insects, puppy hair , can be recyclable Carbon clear out take up stinky heady scent and chemical gas- Hepa filter can seize micro partical, decrease down PM2, virues and bacterial and so forth the Filter Box works in air flow system? Filter Box needs to be utilized with inline fan, ventilation gernerated via means of fan will go through and be purified by way of means of the clear out box, so air from outlet of filter out discipline could also be clear and fresh.