
Floor vents can be fabricated from scrap flooring material. You don't have to purchase it as a special item. They only need to float over the duct opening (snugly or otherwise) and provide adequate perforation to maximize the air flow. A slat design works well. It allows for the largest aggregate void area while keeping a strong supporting surface. An alternate design would be tight rows of drilled holes, but that would be more restrictive. Clean, flush, seamless designs like this require a compromise on frilly features like recloseable flaps and redirecting slats which are available in those standard, but ugly metal grills. Those features have dubious benefits anyway. Mine is just a simple solid vent.
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