The purpose of an Elevation Certification is to provide structure elevation information. This information is used for compliance with community floodplain ordinance and helps to determine proper insurance premium. Paragraph A8 of the Elevation Certificate relates to the area of the crawlspace, the number of flood vents that are installed and the total net area covered by the food vents. To be FEMA complaint there must be one square inch of open in the flood vent for each square foot of enclosed crawlspace area.