INTRODUCTION: HVAC BASICS
5. A return fan may not be present on every unit if the supply fan creates enough of a draw to pull the air back through the system. Preheat System Components/Layout: Dampers Filters Cooling Coil Heating Coil Humidifier Supply Fan Return Fan Preheat Coils Air Flow: This system is a standard air handling unit that utilizes a preheat coil (H).
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