Is there a downside to high merv filters?

While the highest merv ratings are the most effective for air quality, they can damage your HVAC system. A higher merv rating means greater resistance, which means less airflow. When researching HVAC systems, airflow will greatly increase. The short answer is that it can, but it's not really a problem except in extreme circumstances.

Most modern HVAC systems have no problem working with higher merv filters, so millions of homeowners rely on them. The main risk of high-efficiency air filters comes from the fact that they remain unchanged for long periods of time. If you're aware of changing your filters, you're unlikely to experience filter-related issues with your HVAC system. I'm wearing a MerVi cape.

I am using a layer of Merv 1900 3M Filtrete on my mask (I made the mask as a cover so I could remove the filter to wash it). It turns out that sometimes, due to the unintended consequences of high MERV filters, the cure is worse than the problem. Increasing a filter to increase a filter to a higher MERV can increase the delta P through the filter. As you can see above, research shows that overall, HVAC systems with high MERV filters have a higher pressure drop across the filter.

They also found “a clear trend toward lower airflow with higher MERV filters for systems using PSC motors. So, while the MERV rating is over 13, it will be best to avoid going higher in your household. Out of curiosity, let's say that a house has a 4-ton system and the owner wants to use a filter that is commonly found in the local store, for example the Filtrete 1500 MERV 20 x 25 x1.Keep in mind that as the MERV rating increases, the filter becomes more restrictive and will require more pressure and energy to exhaust air. As an HVAC professional with over 40 years, I have seen dozens of systems destroyed by the use of highly restrictive high MERV filters.

Yes, I'm looking for the same thing Yes, I'm looking for the same answer about using a merv13 pleated air conditioning filter as part of a mask. So what can you do to be able to use a high MERV filter and not suffer from a high pressure drop in the filter and consequent loss of air flow (PSC blower) or increased energy use (ECM blower)? In fact, it's quite simple. In addition, a MERV 12 filter that is only 1 (one inch) thick is likely to be more restrictive than a 4 (four inch) thick MERV 12 filter. Air filters that are merv 13 and above are recommended for those who prioritize air quality and may have to handle asthma, severe allergies and other similar circumstances.

AnnMarie Noland
AnnMarie Noland

Amateur coffee expert. Certified twitter enthusiast. Wannabe web aficionado. Certified web trailblazer. Proud twitter buff.

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