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Difference Between FCU and AHU

🔹 FCU (Fan Coil Unit)
FCU is a small HVAC unit that cools or heats a single room or zone.

Features:
Uses chilled water or DX coil
Has a fan + coil + filter
No ducting or very short duct
Limited fresh air (or none)

Used for:
Hotel rooms
Apartments
Small offices
Hospital rooms

🔹 AHU (Air Handling Unit)
An AHU is a large central HVAC unit that supplies conditioned air to multiple rooms or zones through ducts.

Features:
Uses chilled water or DX coil
Has filters, cooling/heating coil, fans
Long ducting system
Can handle fresh air, return air, and exhaust air

Used for:
Malls
Offices
Hospitals
Airports