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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 Blue Screen.
Our best value! The Blue Screen 1" Starter Pack includes everything you need to get started cleaning the air you breathe. It includes one permanent grid and 3 of our BLUE SCREEN air filters, and printed installation instructions. Comparable to MERV 7.
**Prices are subject to change without notice