The product is an automatic foundation vent designed to replace traditional manual vents in crawl spaces or foundations.
Mobile Home Outfitters
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It typically fits standard vent openings (for example 8″ × 16″) and is available in white (or other colours).
eBay
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The “automatic” function means the louvers open or close based on temperature (via a bi‐metal coil) — so when it’s warm, the vent opens for airflow; when it’s cold, it closes to conserve heat/ prevent freezing.
Mobile Home Outfitters
+1
Material: The body might be plastic or thermo‐plastic, or sometimes metal/ aluminium, depending on the model.
