The plurality of diagonally formed apertures function to allow {HEAD ~ air flow} throughout {TAIL ~ the T} shaped two piece housing 
The plurality of diagonally formed apertures function to allow { HEAD ~ air flow } throughout { TAIL ~ the T } shaped two piece housing
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH