The filters we buy are designed to keep our air conditioning and air filtration systems clean. So when the manufacturer says something is 16x16, it's not that size. There is a gap through which dirt can affect the system. The filter was difficult to install as it couldn't stay in place, they are smaller than advertised. I didn't have another filter so I had to use a door plug to fill the gap. The gap insulation secured the filter in place with tape. Very disappointed with this brand.
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