I bought the product at 15000 from online buying that is the amazon .com.the installation fee is purely free and the noise levels are also less .i bought the white color sest and its anti bacterial coating eliminates the bacterial organisms at the micro level thus making the filtration effective and clean .the removal of odours in the rooms especialy the closed rooms is the best thing of this air purifier .easy cleaning process and I sugggest that this is the best thing to buy