The 432 Series doors offer a 2" (51mm) panel thickness, a nominal 24-gauge ribbed galvanized steel exterior, and a polybonded back cover.  Polystyrene insulation provides an R-value of 7.35 (1.29 W/Msq) and optional isocyanurate insulation provides an R-value of 11.69 (2.06 W/Msq).  A variety of options makes this door an economical solution for applications requiring a medium-duty insulated door.