clutch cover apertures 240 work in concert with other clutch features to guide air from the input shaft of the transmission to the housing in this embodiment apertures 240 are roughly u00bd u2033 in diameter apertures 240 can be of varying sizes apertures 240 can be formed using any number of techniques apertures 240 can be machined into the cover in one embodiment apertures 240 are molded into the cover 230 cover 230 is composed of stamped steel in this embodiment cover 230 can be composed of any number of materials including aluminum magnesium or cast iron referring now to fig1 and 12 there is shown therein the pressure plate 250 of fig2 pressure plate 250 nests inside of clutch cover 230 of fig2 pressure plate 250 is affixed to the drive plate 200 and clutch cover 230 in this embodiment pressure plate 250 is bolted onto the assembly at 500 pressure plate 250 includes a series of conduits 260 enabling air to flow out of the clutch assembly u2014 radial channels 260 formed in the outer perimeter of the pressure plate 250 as shown in fig1 pressure plate 250 has 24 channels 260 channels 260 work in concert with other clutch features to guide air from the input shaft of the transmission to the housing in this embodiment channels 260 are roughly one eighth inch in diameter channels 260 can be of varying sizes channels 260 can be formed using any number of techniques in the illustrated.