• Efficiency ratings are based on American society of heating, refrigerating and air-conditioning engineers standard 52.2 1999
• Efficiency ranges are defined for small particles E1=0.3 to 1 um, medium particles E2=1 to 3 um and large particles
• Mounts in most third-party return filter grilles
• Provides high-efficiency alternative to 1 in filter
• Easy installation
• Pre-assembled filter easily inserts into and out of existing return grille
• Exclusive frame design nests properly into place
• Low pressure drop reduces strain on equipment, provides a comfortable airflow and maintains equipment efficiency longer than standard filters
• Captures up to 85% of particles passing through the HVAC system
• Up to 10 times more effective than standard 1 in filters
• For most 1 in ceiling or wall-mount return grilles with 18 sizes to choose from

The return grille filter provides a high-efficiency, long life alternative to a 1 in filter. Our patented design, unique to the industry, captures a significant amount of the airborne particles, in the air that circulates through the filter.