Greetings all: While my primary heating is with a Pellet stove, burning 8 tons last season, I've long wanted to get back into having a woodburner to wean me off my oil furnace back-up. I picked up an older Royall Wood Add-On Furnace that needs to be reconditioned, which I'm in the process of doing. There are no grates currently in the furnace. The firebox is firebrick lined and tapers down to a throat above the ash pan. There's a ledge where grates must have been, but gone now. The manufacturer no longer makes the grates for this older model so I'm looking to get them made at a local metalshop. The grate area is 28" by 8". I'm thinking that splitting it into 2 separate 14" by 8" grates is the best. I'm looking for advice on what type of steel to have them use and how far apart should the grates be to allow ashes to drop down. The grates need to have a half inch profile to fit under the firebricks on the sides. Thoughts or comments?? Thanks, FB in Vt.