The higher the MERV rating the more effective the filter is in removing contaminants. Ratings for home use typically range from 1 to 12. As you would suspect, the better performing filters are more expensive. The typical disposable fiberglass panel filter that comes to mind (and shown in this article) is the most common, cheapest and least effective filter available, with a typical MERV rating of between 1-4. The best filters for home use will have a MERV rating of around 11 or 12 and are made from deep pleated electrostatically charged synthetic gradient media, such as the AprilAire Space-Gard 2200 Furnace Air Filter.