set of four split hinge tubular muffle furnace The split hinge design offers a cooler exterior and ease of loading and unloading. This furnace offers horizontal or vertical operation, and High powered heaters for fast heating. This product also includes Mellon's PS 305 rack mounted controls, that bolt into any standard 19" rack.. Mellon Controls are 22" long x 22" wide x 88" high. Muffle furnaces are palletiezed on a 4' x 4" pallet.