ATMOX Internal Mount Crawl Space Vent Covers vs Foundation Vent Covers

The ATMOX covers are a bulk, inside-mount solution for sealing crawl space vents from within, sold five to a pack in one large plate size. The Foundation Vent Covers are a smaller aluminum cover that mounts over a 16 x 8 vent or replaces a foundation block, with a foam board core for insulation. Buy ATMOX if you have many standard 22 x 10 openings and want to block airflow from inside; buy the Foundation Vent Covers if you have 16 x 8 vents, want a metal face that resists corrosion, and value the insulation layer. Owners rate the Foundation Vent Covers well, while ATMOX leans on its warranty and simple screw-in install.

• Choose the ATMOX if you have several 22 x 10 crawl space openings and want to seal them from inside with one pack.
• Choose the Foundation Vent Covers if your vents are 16 x 8 and you want an aluminum cover with a foam insulation core.