Loaded the stove too early - leaving for the day and won't be back till tomorrow. Loaded up the stove with about 7 splits. Stove had good coals and was at ~ 300*. Wanted to make house real warm so wife wouldn't have to load. Stove top now at ~ 625*. Completely shut down early - fire raging. VERY worried about the stones. Should I open or close the stovepipe damper??? Egad - won't do this again - any quick advice! Cheers!