Split Ac Outdoor Maintenance

 Functions:

 • Filtration (G4 to HEPA as needed)

 • Heating/Cooling (DX or chilled water coils)

 • Humidification/Dehumidification

 • Fan section (EC/plug fans for VFD control)

 Energy Recovery: Often integrated with HRW or ERV

 Application: Office buildings, malls, industrial spaces

Flexibility:

 • Modular / Custom / Packaged

 • Single or dual-duct, vertical or horizontal

 Control: DDC/BMS-compatible for zoning and efficiency

FAHU (Fresh Air Handling Unit)

 Air Source: 100% treated outdoor air only

 Functions:

 • Primary filtration (G4/F7), pre-treatment coils

 • No return air mixing – dedicated to ventilation

 • Integrated enthalpy wheel or heat recovery coil for energy efficiency

 Application:

 • Cleanrooms, hospitals, pharma, data centers, labs

 • Ensures IAQ & positive pressure

 Design Considerations:

 • May include UVGI systems, CO₂/VOC sensors

 • High latent/sensible load handling, especially in tropical climates

Pro Tip for Design Engineers 👨‍💻 

Pairing FAHU with AHU enables dedicated outdoor air systems (DOAS) – optimizing air quality and thermal load management. This hybrid strategy meets ASHRAE 62.1/90.1, LEED, and Green Building compliance.

🧠 Knowing when to deploy AHU vs FAHU isn’t just about air—it’s about health, energy, and code compliance..