... school, clinic,hospital, kitchen, warehouse, garage, restaurant, bar, etc.Efficient Area: Control up to 3,000 square feet of coverageB ... :Negative ion + UV light + Tio2 photo catalytic filter + HEPA filter+ Activated Carbon filter + Ozone (for optional)Product dimension: L209x W306 ... technology, environmental natural bacteria killing rate can be as high as 97.6%.3,Negative ion combines small dust, ...