Recessed Crawl Space Vent Cover vs ATMOX Internal Mount Crawl Space Vent Covers

Both are flat plastic plates that screw to the inside of a foundation vent to block outside air. The Recessed Crawl Space Vent Cover is a finished, recessed cover sized for a standard 8 by 16 inch opening, so it looks clean and seals tight on thin or block walls. The ATMOX is a plain 22 by 10 inch plate sold in packs of five, which suits covering many vents at once or openings larger than standard. Owners report both are simple to install; the ATMOX has a 3-year limited warranty, while the recessed cover has few ratings but a high average.

• Choose the Recessed Crawl Space Vent Cover if you have standard 8 by 16 inch foundation openings and want a flush, finished seal for an encapsulation or conditioned crawl space.
• Choose the ATMOX Vent Cover if you have several vents to seal, larger or irregular openings, or want a warranty and a multi-pack.