{TAIL ~ The flowing air curtain} or barrier prevents gas from exiting {HEAD ~ the oven interior} when the door is opened, and it also serves to replace or replenish any conditioned air which happens to escape from the oven interior 
{ TAIL ~ The flowing air curtain } or barrier prevents gas from exiting { HEAD ~ the oven interior } when the door is opened , and it also serves to replace or replenish any conditioned air which happens to escape from the oven interior
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD 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