Cor-A-Vent's PS-400 Strip Vent is a 1" wide by 3/4" high (vertical dimension) soffit strip that will perfectly match the thickness of a 1x soffit board. The PS-400 provides the same great ventilation of 10 square inches of Net Free Vent Area per foot as the original S-400, but at 3/4" high, it can fit into tighter places where the S-400 can't. Installation is easy with PS-400 -- just cut an inch off the soffit board and nail PS-400 to the end, creating a pre-vented soffit panel.