When you're shopping for an air filter online, it's essential to be aware that they come in two sizes. You should also be familiar with the nominal size, which is the size printed on the filter frame. It's usually half an inch smaller than the advertised size. For instance, a 20x30x1 filter may be labeled, but if you measure it, you'll observe that the actual size is smaller.
The Home Depot provides a comprehensive selection of air filter accessories to keep your system running at peak performance. It's critical to pick the right size filter so that it doesn't bend or damage it, or reduce its capacity to function correctly. The MERV classification indicates filtration efficiency and is one of the most important factors when selecting an air filter. The higher the MERV rating, the more dust it will capture.
The lower rating implies it will capture less dust. The FPR also indicates what type of airborne contaminants are suitable for capturing each filter. If you choose an air filter with a MERV 13 rating, it can last up to six months before you have to replace it. An HVAC specialist would install a small cabinet next to the boiler or air controller (on the air intake side) to hold the thicker filter. Naturally, everyone desires cleaner air in their home or business. If you have to force an air filter in or out, it's the wrong size, so standard sizes are usually half an inch smaller than advertised.
But these are usually filters with a rating of at least MERV 11, which is when filters start to trap most particles the size of common allergens.
