Well made air filter but comes in smaller sizes. 12 x 18 x 1 inch was actually 11.5 x 17.5 x 7/8 inch. It covers most of the vent, but the vent is in my bedroom and when the air flow starts you can clearly hear the filter dropping and hitting the vent. Unfortunately, it's not always easy to find a filter my size, let alone a filter of this quality. And the search continues.
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