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The PERMANENT GRIDS are placed into the air returns one time on the top lip of the opening and stay there permanently. Once they are installed, it is ONLY necessary to replace the...
- Most used with high efficiency units:
- Comparable to MERV 11
- Highest particle-holding capacity of dust and harmful microscopics:
- with Good Air Flow
- BEST for Dust & Allergies:
- Best Overall Filter