Installation Requirements and Instructions

The following requirements for installation apply regardless of whether engineered openings or non-engineered openings are used to satisfy the NFIP requirements. You’ll find the technical information in the FAQs, but simply put, FEMA/NFIP requirements for flood vents include:

  • A minimum of one square inch of net open area for each square foot of enclosed area for non-engineered openings OR A minimum of ONE engineered inch for each square foot of enclosed area for an engineered opening.
  • A minimum of two vents per enclosed area, and each must be on at least two different sides of the exterior walls.
  • The bottom of the flood vent opening must not be higher than 12 inches above the adjacent grade.
  • The opening in the wall must be at least 3” in diameter. This requirement refers to the hole in the wall and not the flood vent. See FEMA TECHNICAL BULLETIN 1-2008 page 21 AND 26.


Flood Vent Installation Instructions


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Flood Solutions LLC
1 Industrial Park Drive, Bldg. 27
Pelham, NH 03076

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