Are you looking for the perfect air filter for your furnace or HVAC system? If so, you need to understand the Minimum Efficiency Reporting Value (MERV) rating. This rating tells you the size of air particles that the filter can trap. The higher the rating, the smaller the particles it can capture.If you already have a filter in your system, it's easy to find a replacement. Just look for the same size printed on the filter frame.
For a popular air filter size, search for a 20x25x1 air filter or check out our guide to find all the 20x25x1 air filter purchase options. The table below lists standard size 1, 2, and 4 inch deep air conditioning filters for your air conditioner, furnace, air conditioning, and atomic filters. It also shows percentages based on the likelihood that an air filter will capture dust particles based on their size in microns. It's important to replace your boiler filter regularly. Depending on the size of the filter, you should replace it every three to 12 months. The fan is usually located in a central place in the house, near the air intake vents.
To determine the appropriate filter size, measure the existing filter or consult the manufacturer's specifications.
