and cooling and rendering less spontaneously combustible the downdrafted gases by injecting steam by product of the water quenching into {HEAD ~ the stream} of downdrafted gases downstream of the airbox zones with respect to stream flow and upstream of {TAIL ~ the fan} 
and cooling and rendering less spontaneously combustible the downdrafted gases by injecting steam by product of the water quenching into { HEAD ~ the stream } of downdrafted gases downstream of the airbox zones with respect to stream flow and upstream of { TAIL ~ the fan }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL