MERV Ratings: The Key to Cleaner Indoor Air

At Economy Hearth & Home Inc., we often encounter questions about air filtration in HVAC systems. One of the most critical aspects of maintaining good indoor air quality is understanding MERV ratings and their impact on your home’s air circulation.

What is MERV?

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

MERV Rating 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: Residential and commercial filtration
• MERV 9-12: Superior residential and better commercial filtration
• MERV 13-16: Hospital and general surgery-level filtration
• MERV 17-20: HEPA filtration for clean rooms and radioactive materials

Choosing the Right MERV Rating

When selecting a filter for your HVAC system, it’s crucial to balance filtration efficiency with airflow. While higher MERV ratings offer better filtration, they can also restrict airflow, potentially causing strain on your system. Most residential HVAC systems work best with filters in the MERV 8-13 range.

The Impact on Indoor Air Quality

Proper filtration can significantly improve indoor air quality by removing:

• Dust and pollen
• Mold spores
• Pet dander
• Bacteria and viruses

At Economy Hearth & Home Inc., we recommend regular filter changes and professional HVAC maintenance to ensure optimal performance and air quality in your Silver Spring home. Understanding MERV ratings empowers you to make informed decisions about your indoor air quality and HVAC system efficiency.