Without an air purifier your house can collect a lot of dust and other problems, but purifiers aren’t cheap. If you’re on a budget, you can create a simple DIY purifier.This is easy to make and it’s very efficient. It’s the best way to fight particulate air pollution, dust, smoke, etc. without spending a fortune.All it takes to have cleaner air in your home is a 20 inch box fan, furnace filter, and 4 zip ties. This project is super simple for anyone to do and you will breath in the results immediately. If you have allergies or live in a city, you should consider building this relatively inexpensive high performance box fan air filters.