The smoke is drawn into the unit by the evaporator fan motor, & as the smoke travel through the filter & evaporator coil it leaves a sticky light brown residue, which causes filter & coil to get dirty quickly along with leaving a unpleasant smell.
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The smoke is drawn into the unit by the evaporator fan motor, & as the smoke travel through the filter & evaporator coil it leaves a sticky light brown residue, which causes filter & coil to get dirty quickly along with leaving a unpleasant smell.