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This is the flapper opened 1/2-way.  So some heated air will enter the cabin and some will exit to the atmosphere.

This is the flapper opened 1/2-way. So some heated air will enter the cabin and some will exit to the atmosphere.

IMAG1678.jpg IMG_1042.JPG aero_09.jpg Bus_heat_008.jpg IMAG1695.jpg aero_01.jpg aero_3.gif