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Dear Ms. David Wang,We are interested in being sales agent of air purifier in our region. So that we investigate air purifers with PES system.Please tell me more info about spare parts and maintenance. How often is it recommended to change some spare parts? And want to know if this device has sensor of air cleaning regulator that change the speed automatically according to the air quality.Does it deodorise an air ?And finally let me know about waaranty and price of device for 50-100 m2 capacity (1 unit as sample).Please calculate door to door terms of delivery.What certificates do this device have?What is warranty period?Thanks.Sincerely,Samir MamedovAzerbaijan/Baku+99 455 222 25 68