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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.

IMAG1647.jpg aero_1.gif GW_turnsignal_switch_004.jpg Bus_heat_008.jpg 004.JPG Bus_duct_wrap_013.jpg GW_beam_switch_001.jpg