This filter is advertised as a 16x20x4 filter but is 0.5 inch shorter on both sides. The attached photo shows the difference in size from my old filter. This cheap cost cutting by the company prevented it from fitting properly in my filter holder. Even if it could fit without falling off, the 0.5 inch air gap around the edge would allow dust to pass past the filter and collect on the spools behind the filter.
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