This is an inexpensive air cleaner. The total project cost approximately $35.00. I went to a heating and air conditioning establishment. I was looking for a used squirrel cage blower. To my suprise they offered me one for free. Only requirement was I had to get it out of the air conditioner myself. So about 15 minutes later I had a blower at a great price. As you can see the air cleaner has a simple design. A box with two 12x24 filters on the intake end and one filter on the other end and a squirrel cage blower in the middle. I purchased a three way switch, asked the genius next door (Steve) for some help in wiring it. It works better than I had imagined. It has already made a difference in my garage.