If you've read all the other Filterbuy product reviews, you know they reduce airflow *greatly* and damage your equipment. Within a week this filter was causing the coils on my AC unit to freeze. Even using thick Merv 11 corrugated material on the back of my fan caused the motor to overheat. Choose known brands, not fakes. Something tells me the materials they are using are NOT official Merv numbers. These filters scream at me that they are fake from China. stay away
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