I have a United States Stoves Hotblast furnace with dual blowers, two 8 inch air ducts, and 6 inch exhaust piping. It has a lower air feed control on dust pan door, and another air feed control on main opening door. I have round 8 inch ductwork going to two separate places up to the floor above. By the way, it is located centrally in the basement. I am really having some problems controlling how hot the stove burns. Last night I loaded up the stove at about 11 pm and at about 1 am I got up to a stove which had pegged my thermometer on the face of the stove to well over 900 F. The air controls were only opened slightly and the seals are good on the doors. This really concerns me, because of possibly igniting a fire. Any suggestions? Thanks.