"Concave" refers to the shape of the curve on top of the fence. If the the arc is lower in the center than at the posts it's concave. If the arc is higher in the center than at the posts it's convex.
|Privacy Level||100% Tongue and Groove|
|Bottom of Fence|
3'-6", 4'-6", 5'-6", 6'-6", or 7'-6"
|Scallops||Convex or Concave|
|More||Other Vinyl Styles|