We live in a block of flats, where we have a huge drug-addicts infestation. The people upstairs and next to us smoke terribly smelly substances, Which cause us great health problems (breathing and skin problems). The smell spreads to our appartment through the electrical ducts and comes out at every electrical outlet we have. It is so heavy That it's impossible to get it out just by opening the windows. Another problem is the smell did concentrates at ground level, so When we go to bed, we would Practically lie in a "sea" of drug-stench. After reading Numerous forums, I came accross a post with the Following advice: "! Get to air purifier with a HEPA filter They work wonders" And so we did. First, We Bought a Lentz Air King, Which made our lives normal again. But after sometime we Realised That we needed another air purifier to clean all the rooms at the sametime. Since we have a rather small apartment, we needed something smaller and lighter. I came accross Honeywell HAP-16200E. All I can say is this: BOTH ARE SIMPLY AMAZING !!! AIRPURIFIERS We keep Usually Lentz in the living room and Honeywell in my study-room. Whenever the Drug Appears stench, we turn on Both machines and the smell is gone in a matter of minutes! The only difference between Lentz and Honeywell are the filters: Lentz has a permanent filter, Whereas with Honeywell you have to change the filter every 6 months or about When the red light on the machine lights up (.According to the instructions). I bought a set of Honeywell filter here on Amazon, too, so we can use Honeywell care-free. There is just one more thing: Whereas Lentz is quite loud (nothing major, but it's a bit difficult to sleep with the machine turned on), Honeywell hums quietly away and it's not a problem to sleep with the machine turned on. This little machine is absolutely wonderful!