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These are aluminum covers that mount over 16 in. x 8 in. crawl space foundation vents. They block leaves, debris and rodents from getting in and help hold warmth so pipes are less likely to freeze. Each cover is a simple rigid panel with a spring, so there is nothing to wire or power. Compared with plastic vent plugs, aluminum holds up better outdoors and resists weather, but it is a fixed cover rather than an adjustable or insulated one. They suit homeowners winterizing a crawl space or sealing vents against pests.
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Lowest price we've seen: $22.63 on Nov 12 at Amazon. Tracked across 1 store since Nov 12.
These GAF Master Flow foundation vent covers are made of aluminum. They mount over most 16 in. x 8 in. foundation vents. The covers help lower the risk of frozen pipes in a crawl space.
They also deter debris, leaves and rodents from entering the crawl space. Each package contains 2 covers and 2 springs.
