For those who don't already know, it is possible to create a DIY air filter on the cheap using a box fan + furnace filter. Is there a big difference between Merv and HEPA? Merv stands for Minimum Efficiency

Do you want to improve the air quality in your home?  If you do, you may be interested in buying an air purifier.  If you do, you will want to examine those that rely on the use of HEPA technology,