I seem to remember,when growing up in West Sussex,England,in the 1950s, everyone seemed to have a Rayburn or Aga stove,often burning coke--they were all fitted with an airflow-controlling "damper". Plus ; "damper" was something we made at Scout Camp. A ghastly-looking paste was made with flour and water,then you rolled a stick in it until a decent thickness built up,then it was placed in the campfire until it went black,after which one was supposed to consume it with both relish & enthusiasm, so I left and joined the Sea Cadets instead (where the songs were better,more lurid, and much more graphic !).