Understanding MERV Ratings for Better Indoor Air Quality

At B&B Heating & Air Conditioning, we believe that knowledge is power when it comes to maintaining a comfortable and healthy home environment. Today, we’re diving into the technical world of MERV ratings and their crucial role in air filtration systems.

What is MERV?

MERV stands for Minimum Efficiency Reporting Value. It’s a standardized measurement scale developed by the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) to rate the effectiveness of air filters.

The MERV Scale

The MERV scale ranges from 1 to 20, with higher numbers indicating better filtration:

• MERV 1-4: Basic filtration for window AC units
• MERV 5-8: Standard residential filters
• MERV 9-12: Superior residential filters
• MERV 13-16: Hospital and general surgery-grade filters
• MERV 17-20: HEPA filters for clean rooms and specialized environments

Particle Size Matters

MERV ratings are determined by a filter’s ability to capture particles of various sizes. The scale measures efficiency for particles ranging from 0.3 to 10 microns. For context, a human hair is about 50-70 microns in diameter.

Balancing Act: Filtration vs. Airflow

While higher MERV ratings offer better filtration, they can also restrict airflow. This may cause your HVAC system to work harder, potentially reducing energy efficiency. It’s crucial to find the right balance for your specific system and needs.

Choosing the Right MERV Rating

For most residential applications, filters with MERV ratings between 8 and 13 provide excellent air quality without overly restricting airflow. However, homes with occupants who have respiratory issues or allergies may benefit from higher MERV ratings.

At B&B Heating & Air Conditioning, we’re committed to helping you make informed decisions about your HVAC system. Understanding MERV ratings is just one way we ensure top-quality service and installations for our valued customers.

Remember, regular maintenance and filter changes are key to maintaining optimal indoor air quality. Contact us today to schedule a consultation and breathe easier in your home!