I purchased a Zephyr XXL air purification system when I was living in an illegal basement suite. The landlord had just rented the upstairs suite to a group of dirty construction guys. Now when my family first moved into this place we were informed it was a NON SMOKING home and yet once the landlord moved these guys in, they proceeded to turn my home into an ashtray. I begged them to stop, I even offered to pay them their smoking deposit back because my 2 daughters, aged 4 and 2, were starting to show signs of SMOKERS COUGH!! They would start smoking at 5 am, and I would have to actually wake my kids up, and leave the home for the entire day, no matter the weather, until late in the day. It was Hell on Earth. The first day we owned the Zephyr, I was sold. We woke up late in the afternoon without the ligering death cloud of toxic smoke. We were able to actually LIVE in the home we were renting happily. I dont know where I would be without it, and I tell EVERYONE to spend the money, be smart, and buy one.