Throughout this site we use many technical terms, and given the breadth of readership our site enjoys, sometimes we are remiss and incorrectly assume everyone knows what we are referring to. For those that do not, here are some explanations of the technical terms use.
Flap Valve
A flat plate hinged on one edge to direct air alternately to either of two ducts or shut off the flow, as used in heating and ventilating systems of vehicles.
