MERV11 Pleated Filters are a significant upgrade in filter efficiency over pleated MERV8 filters with nearly the same resistance levels. MERV11 filters provide high filtration performance (60-65% average efficiency) while saving energy with a low pressure drop. 1" , 2" or 4" thickness allowing you to upgrade your existing filter without modification , MERV11 filters are an ideal choice for most homes to improve air quality or commercial applications to reduce airborne particulates. Depending on your application MERV11 filters can last up to 90-days.