• MERV 16* available in 5'' box and 5'' or 6'' expandable
• MERV 15* available in 3'' box
• MERV 10* available in 3'' or 5'' box and 5'' and 6'' expandable
• MERV 8* available in 1'' box

* MERV = Minimum Efficiency Reporting Value. Describes the filter's ability to capture particles and ranges from 1 to 16. Typical fiberglass filter = MERV 1. The higher the MERV rating, the better the filtration