The air curtain or barrier is generated by {TAIL ~ a ported manifold} and supply located either on the oven housing exterior adjacent the opening or inside the oven housing adjacent {HEAD ~ the opening} 
The air curtain or barrier is generated by { TAIL ~ a ported manifold } and supply located either on the oven housing exterior adjacent the opening or inside the oven housing adjacent { HEAD ~ the opening }
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD