US Stove 40102 Coal Grate Frame Replacement

HOW CAN I PREVENT GRATE BURN-OUT AND WARPAGE OF CAST IRON PRODUCTS? All grates are constructed of cast iron which can "burn out" or oxidize rapidly - or warp so severely the grate becomes immobile. There are two ways to prevent such problems: 1) never over fire your furnace or stove, by leaving the feed or the ash door open during operation. 2) Failure to empty the ash pan and allowing ashes/cinders to accumulate to the point of contact with the grate can quickly warp or burn out the grate. To function properly - and endure for years as intended - grates rely on the flow of cooling air to prevent warpage or burn out.