Two to five inch thick versions of these filters fit in box-like housings mounted onto the air handler and can last up to one year. Given the restricted air flow of some installed systems, even a 4” or 5” deep high efficiency filter cannot be used. Another reason you would want to get a MERV 13 filter is if there is a smoker in your home. These filters can remove particles as small as 0.3 microns and other debris like microorganisms and bacteria. MERV 8 filters remove basically the same particulates as a MERV 6, but they are more efficient; with a dust spot efficiency of 30-35%, they are 20 times more efficient than regular fiberglass filters. Messages 28 Location Near Mobile. Filters in this range are usually 1-2-inch pleated filters. Filters with higher MERV ratings trap small particles more effectively than filters with lower MERV ratings. The more sensitive a person is to allergens, the greater the need for a high-efficiency filtration system. Once the filter dirt catching capacity is at the end that will cause the air flow to be restricted which will cause numerous problems. Periodic changes to the filter design can add to the price. V. vweosdriver. Is MERV 11 too high? These filters can remove particles as small as 0.3 microns and other debris like microorganisms and bacteria. If the MERV rating on your filter is too high, it may force your furnace to work too hard and become vulnerable to damages. High-efficiency pleated; MERV Rating 11-16 Made from 4-5 inches of cotton or similar material makes these types of filters have the highest MERV rating. Choosing filters with deeper pleats (e.g., four-inch pleats) will increase the surface area of the filter and potentially reduce the pressure drop while increasing or maintaining a high MERV rating. This chart also shows that as the efficiency of the media increases, the resistance also increases. MERV 8 rated filters are high quality filters. MERV 11 to 13 are high-efficiency filters that come in a variety of configurations. The efficiency of the air filter should be a top consideration. If your family has health or allergy issues, then you may want to look for a high-efficiency filter that’s MERV 11 or higher. You need to find the rating that is not too high, not too low, but just right. IIRC merv 11 is abit high but possibly not too high. Choosing the right furnace filter is like the story of Goldilocks and the Three Bears. You’ll also have to change these filters more frequently than filters with a lower MERV rating. Yet these types of filters have some negative consequences too. Look for cleaners with MERV ratings of 10 or higher, as this indicates a more efficient filter. It also helps if you tell us what size. If the pressure drop seems acceptable, I will stick to MERV 11. The test protocol for determining MERV ratings is described in the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) Standard 52.2-2007, Method of Testing General Ventilation Air-Cleaning Devices for Removal Efficiency by Particle Size. Disposable pleated high MERV filters (11 to 13 MERV): High-efficiency filters can trap 0.3 micron particles like bacteria and some viruses. Iam not a fan of 1" filters. Using an air filter with too high of a MERV for your system can have a similar effect of a clogged air filter, if a filter becomes clogged, airflow will be reduced, which causes the fan motor to work harder. MERV 11 to 13 are high-efficiency filters that come in a variety of configurations. A MERV 11 would be considered an “allergy” filter that does a good job of removing particles in all size ranges. In some cases, using an air filter that is too restrictive for your system may cause low air flow problems as well. High-MERV (11) 0.32 i.w.c. An air filter’s minimum efficiency reporting value (MERV) rating measures how effectively the filter stops dust and other contaminants from passing through the filter and into the air stream. I may even be temped to go to MERV … MERV is a good way to help judge the effectiveness of an air filter. Some are five inches thick, others range up to 12 inches thick, and some of these filters are designed to last up to a full year. Is MERV 13 too restrictive? Some homeowners want cleaner air, so they buy an HVAC filter with a high "MERV rating." This is the first time in the seven years it's been in operation that I've been having problems. If the pressure drop is too high, I will reluctantly go back to MERV 8. One of the issues with the furnace is that 1 inch MERV 8 pleated filter I installed is being bent toward the blower like a sail when the blower runs. 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