Do Higher Merv Filters Restrict Airflow

While the highest MERV ratings are the most effective for air quality, they can harm your HVAC system. A higher MERV rating means a higher resistance, which means less airflow.

What's a disadvantage of the highest MERV rated filters?

One disadvantage of the highest MERV rated filters is that: The pressure drop across high MERV filters is more.

Do some air filters restrict airflow?

All filters will restrict the air flow to some extent because, in every case, the air has to move through the filter for the unit to be able to remove the particles in the atmosphere. The higher the MERV rating, the denser the filter is going to be, and so the more restricted air flow will become.