Preferably, however, the chamber is slightly leaky in both directions so that a pressure barrier, which builds up within the kiln as it generates reducing gases, prevents an oxidizing atmosphere from entering {TAIL ~ the kiln chamber} or {HEAD ~ rapid atmosphere exchange} 
Preferably , however , the chamber is slightly leaky in both directions so that a pressure barrier , which builds up within the kiln as it generates reducing gases , prevents an oxidizing atmosphere from entering { TAIL ~ the kiln chamber } or { HEAD ~ rapid atmosphere exchange }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD