Air (or any other fluid) forced over a hot plate will remove heat from the plate according to the rules of forced convection. If the air's velocity is slow enough and the plate length short enough, we can expect the flow in the boundary layer near the plate to be laminar.
Use this calculator to calculate the heat rate removed from the plate under such a laminar flow assumption. We also assume that the plate is maintained at a constant temperature (i.e. isothermal). (The default calculation is for a relatively hot, small rectangular plate immersed in a medium velocity air stream at room temperature, with answers rounded to 3 significant figures.)