Enclosure Venting

               Rule of thumb for enclosure venting   

       		.........V/A < 2000 in...........
		     V = volume of enclosure
                       A = area of holes

Allowable Hole Sizes

    This rule of thumb optimizes your EMI design for venting

                .............4L/D................
                 L = length of hole or matl thk
                        D = dia of hole