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How many recirculation fan in the AC system and what is it functions?

April 26, 2017AC fan functions recirculation system

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How many recirculation fan in the AC system and what is it functions?

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Four fans, two upper and two lower. Recirculation fans help the pack to operate at reduced flow (each one save 01% of fuel burn). Upper recirculation fans draw air from the area above PAX and recalculated to zone duct. Lower recirculation fans draw air from under floor area and recalculated to conditioned air manifold.