The fact that {HEAD ~ the exhaust system} will deliver {TAIL ~ the air} backwards or to the side may help prevent fogging of certain things, such as car or truck windows 
The fact that { HEAD ~ the exhaust system } will deliver { TAIL ~ the air } backwards or to the side may help prevent fogging of certain things , such as car or truck windows
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH