Crawl Space Door with Louvers for Crawlspace Access, Ventilation, or Encapsulation (24"x36") Crawl Space Doors are durable and easy to install! Each size describes opening within the frame! Add 3" to each side for total dimensions because of mounting frame. For example: 16"x32" total dimensions would be 22"x38". Flush mount install over the foundation opening. 3" Frame for mounting Only vented crawlspace 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