SmartVENT is a certified, code-compliant foundation flood vent that protects a home's foundation during a flood by relieving hydrostatic pressure on the wall. The 1540-510 model also performs a second function, featuring louvers that automatically open and close with the temperature changes to allow airflow. The vents can be installed in masonry walls, 2x4 or 2x6 framed walls, overhead garage doors, and fire walls. Smart Vent Inc. 877-441-8368.