ASHRAE 52.2 is a standard set by the American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE) for the testing and rating of residential air filters. The standard provides a consistent method for measuring the efficiency of air filters in capturing particles of different sizes and provides a way for consumers to compare the performance of different filters.

According to the standard, filters are tested and rated based on their Minimum Efficiency Reporting Value (MERV) which ranges from 1 to 20. The higher the MERV rating, the more efficient the filter is at capturing particles.

ASHRAE 52.2 also specifies the recommended MERV ratings for residential air filters. It recommends a MERV 6 filter as a minimum standard for residential use, which is sufficient for capturing larger particles like dust and pet dander. For homes with moderate allergies or respiratory conditions, a higher rating like MERV 9 through MERV 11 filter is recommended, which is capable of capturing smaller particles like pollen and mold spores.

It's worth noting that ASHRAE 52.2 does not account for the pressure drop, which is the resistance the filter puts on the airflow of the HVAC system. Therefore, It's important to ensure that the filter not only has the appropriate MERV rating for your home's needs, but also doesn't cause too much restriction to the airflow. Pressure drop is usually measured in inches of water gauge at various airspeeds. Consult your HVAC professional technician for any standards for your unit.

Cycle Air furnace and AC filters are rated between MERV 7 and MERV 9 and have acceptable pressure drops for standard residential equipment to ensure optimal system performance while also filtering air to improve indoor air quality.