Crawl Space Door with Louvers for Crawl Space Access, Ventilation or Encapsulation (16" x 32") 3" mounting frame over foundation opening. Be sure to account for this in your measurements. Flush mount install over the foundation opening. Sizes describe opening within the frame. Only vented crawl space door on the market. Perfect for ventilation or encapsulation. Made of durable ABS / UV treated plastic. Won't rust or rot. Paintable with a plastic adherent paint.