The product is called Smart Vent and you can read more about it at SmartVent.com It looks like a pretty impressive product, and the company claims that you can save money on your insurance by installing these vents on your home.
From their website...
"Smart Vents Are Code Compliant, FEMA accepted and ICC Certified
That's why hundreds of homeowners across the country are realizing huge savings on their NFIP insurance premiums after they install SMART VENTS in their homes to bring them into compliance.No one can stop the deadly forces of nature, but for anyone living in a flood prone area, this is one easy way to save money on flood insurance, and buy yourself some peace of mind.
Here's How it works:
Flood Protection:The Smart VENT® door is latched closed until flood water enters. Entering flood water lifts the patented internal floats which unlatches and rotates the door open. This allows the flood water to automatically enter and exit through the frame opening, relieving the pressure from your foundation walls.
Ventilation: A bimetal coil (like a thermostat, no electricity is needed) automatically opens and closes the ventilation louvers as temperature changes. They will be closed when it is freezing outside and open when it is warm outside to provide natural ventilation.
Important note:SmartVENT® does not rely on the louvers to let flood water in and out. Regardless of the louvers' position, opened or closed, when flood water flows into the door, the internal floats release the door to rotate open to relieve the hydrostatic pressure. The louvers and pest screen are rotated out of the path of the flood water. The temperature controlled louvers are for ventilation purposes only. "
