Patent ID: 8308396

Claim:
A flood vent for a structure comprising: a shuttered duct with an upper and lower region formed in a housing fixed in the structure to allow the unimpeded movement of floodwaters through the structure, wherein said lower region of said duct is angled down between two and eight degrees from a horizontal plane to form a sill that sheds water to an exterior of the structure; said upper region of said duct is pivotally fixed to a shutter positioned within said duct, wherein said shutter swings between a closed position and an open position in response to a floodwater pressure differential in said duct; and a lower region of said shutter releasably coupled to a portion of said sill by a fin, wherein width of said fin and angle of said sill defines a coupling region along said sill wherein said shutter substantially obstructs said duct to prevent animal passage along said duct and wherein said fin is slideably fixed to said lower region of said shutter to alter said coupling region between said shutter and said sill.