The Alen A375 UV HEPA air purifier is combined with a 4oz bottle of the MCP smoke odor spray to provide a complete package in removing smoke and bathroom odors. VOC's (Volatile Organic Compounds) are harmful vapors that are emitted from items such as glue, paint, laminated furniture and certain aerosols. If there is not sufficient ventilation with the outdoor air and VOC's are present, the indoor pollution level Pre-filter/HEPA Filter/Enhanced Activated Carbon Filter all-in-one makes filter changing easy ; Effectively removes smoke, pollen, dust, animal dander, dust mites, molds, bacteria and viruses ; Built-in Ionizer to effectively minimize pollutants. Ionizer Filter Type: HEPA & activated carbon ; Power: 120V ; Noise Level: 36 dBa on low, 65 dBA on high See Noise Level Chart ; Filter Efficiency: = 99.97% ; Room Size: Up to 800 square feet; 400 square feet for best performance ; Unit Size: 18.5" x 8.23" x 17.4