The typical fly heights for loads on our porous air bearings are of the order of 5 μm, with the exact value chosen according to the stiffness required. For transport and inspection applications where conveyor air bearings are used, such as for Flat Panel Displays or flexible foils, larger fly heights between 20 and 100 μm are normal. As air bearings are loaded, the air gap gets smaller and the pressure in the air film rises—both of which contribute to higher stiffness. Where constant gaps and/or stiffness is required pre-loading can be applied. We provide lift-load curves for all our bearings. For a chosen bearing these specify the fly height of a given load at a given input pressure. The gradient of this curve is the stiffness under the given conditions.