When the pitched roof is utilized, the vent cap is removed and {HEAD ~ air} exiting the stub venting tube exits through the vent throughbores in the pair of gable ends of {TAIL ~ the pitched roof} and out into the ambient 
When the pitched roof is utilized , the vent cap is removed and { HEAD ~ air } exiting the stub venting tube exits through the vent throughbores in the pair of gable ends of { TAIL ~ the pitched roof } and out into the ambient
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD 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 OTH OTH OTH OTH