Crawl Space Manual Air Vent with Removable Cover and Vermin Screen - 8"x16" (White) 8"x16" air vent with cover. Flush mounted OVER opening. Total dimensions 11"x19" because of 1.5 inch mounting flange. Great for ventilation and encapsulation:Made of durable ABS plastic (no rust or rot) NFA (Net Free Airflow) 95 sq. inches  almost double the amount of other air vents | Built to last: no rusting  save money quit replacing crawlspace vents year after year! Paintable with plastic adherent paint | Installation hardware included