How Long Does a Merv 11 Filter Last?

Find out how long does a Merv 11 Filter last and how often should it be replaced for optimal indoor air quality.

How Long Does a Merv 11 Filter Last?

For Merv 8, 11 and 13 filters, it is recommended to change the filter at least every 3 months for better filtration and healthier air in your home. However, if the filter is made of fiberglass, experts suggest changing it every 30 days. On the other hand, pleated filters can last up to three to six months. If you're not sure how often to replace your oven filter, you can do a visual check.

If there's only a thin layer of dirt where you can still see the filter underneath, you don't need to change it yet. But if there is a thick layer of dirt where you can't see the filter underneath, it's time to change it. We recommend that you do a quick visual check of the filter every 3 to 4 weeks if you are not sure how often to replace your oven filter. When it comes to air filters rated MERV 11 or higher, they typically require replacement every three to six months.

To obtain high MERV ratings and greater thickness, these filters usually need two filter changes per year. Most air filter manufacturers and HVAC companies suggest changing the air filter every 90 days or 3 months. This may vary depending on the location of your home, if you have pets, and the age of your system and equipment. If you have pets in the house, you should consider changing the filter every 60 days or 2 months.

For homes with multiple pets or people with allergies or respiratory conditions, we recommend that you change the filter every 20 to 45 days. Vacation homes or empty houses that aren't used much can wait to change filters every 9 to 12 months. The more you use your home, the more often you'll need to change your air filter. A general rule for pleated air filters is to replace them every 90 days.

As the filter traps more dirt, dust and allergens from the air, its efficiency decreases. If you feel a drop in pressure in your home or notice a difference in the performance of your heating and cooling system, a dirt filter is often the first place to look. It's important to note that there are high-efficiency filters that are designed to filter out small bacterial, moldy and fungal particles, but standard MERV 8-11 filters only block the largest particles of dust, dirt (&) from hair. A new air filter in your home is like a new one in your car; it improves the air in your home, keeps the boiler in perfect condition and helps control dust in the air.

Air filters are usually made of spun fibreglass (the same thing that forms the insulation of the attic) or 26% pleated paper framed with cardboard for greater stability and rigidity. If replacing the air filter is simply out of the question for an extended period, going longer than 90 days won't cause irreparable damage to your air conditioning system. If you have someone with asthma or allergies at home, change the filter every 6 weeks to make sure the indoor air quality is optimal.