US 11,753,816 B2
Building foundation ventilation system
Henry Bennie Marshall, III, McClellanville, SC (US)
Assigned to Your Crawl Space, Inc., Awendaw, SC (US)
Filed by Your Crawl Space, Inc., McClellanville, SC (US)
Filed on Nov. 16, 2021, as Appl. No. 17/527,979.
Claims priority of provisional application 63/128,503, filed on Dec. 21, 2020.
Prior Publication US 2022/0195720 A1, Jun. 23, 2022
Int. Cl. E04B 1/70 (2006.01); F24F 7/013 (2006.01); F24F 7/00 (2021.01)
CPC E04B 1/7076 (2013.01) [F24F 7/013 (2013.01); F24F 2007/0025 (2021.01)] 18 Claims
OG exemplary drawing
 
1. A ventilation system for a building foundation comprising:
a flexible cover plate;
an airflow opening disposed in said cover plate;
a fan carried on a rear side of said flexible cover plate, wherein said fan is adjacent to and covers said airflow opening for direct air through said airflow opening;
a flexible polymer foam sheet carried on said rear side of said flexible cover plate and having a fan opening receiving said fan;
wherein a perimeter of said fan is fully surrounded and engaged by said flexible polymer foam sheet forming an airtight seal between said fan and said flexible polymer foam sheet;
wherein a perimeter edge of said flexible polymer foam sheet compresses against and conforms to interior wall surfaces within a vent opening in a building foundation to form an airtight seal against said interior wall surfaces;
wherein said flexible cover plate flexes with said flexible polymer foam sheet when mounting in said vent opening to facilitate conforming and sealing said flexible polymer foam sheet within said vent opening so that said flexible cover plate is secured over said vent opening; and,
wherein said flexible polymer foam sheet comprises a polyethylene foam having a closed cell structure on a front surface and a rear surface, and an open cell structure around said perimeter edge.