HAHU Horizontal
Mini Air Handling Unit
The Polar Air HAHU is a horizontal hybrid AHU–fan coil unit designed for projects where a standard fan coil isn’t enough. With ESP capacity from 100–400 Pa (0.4–1.6 in.wg), it handles complex layouts often found in large indoor buildings such as hospitals, malls, data centers, and agricultural facilities.
A double-skin casing with 25 mm NBR insulation forms a thermal barrier, reducing casing thermal transfer and maintaining stable supply air across both cooling and heating modes.
Access and serviceability are built in: a lift-down bottom panel provides straightforward maintenance, while airflow-diverting ductwork and VAV boxes enable zone-level temperature customization.
The HAHU is a practical choice for niche applications where large or mixed building loads demand more than standard fan coil performance.
5 sizes available · 2-pipe or 4-pipe models · 5R · 5R+2 · 6R & 6R+2 configurations
Advantages
Heating & Cooling
Capacities up to 48 kW provides powerful cooling in summer and reliable heating in winter, for year-round comfort.
Ideal for large indoor spaces, including commercial, healthcare and industrial buildings, including shopping malls, hospitals, warehouses and agricultural.
Double Sandwich Design
Double skin casing with 25 mm (1”) NBR insulation forms a thermal barrier that limits heat gain and loss and keeps supply air closer to design values, especially in tropical or humid environments.
Compared to single skin FCUs, casing losses are reduced, improving efficiency in concealed ducted applications.
Multiple rows: 5R · 5R+2 · 6R · 6R+2
Multiple coil row configurations provide greater surface area for heat transfer, delivering higher efficiency and more cooling and heating capacity.
The added surface also improves latent capacity for better humidity control and more consistent comfort across varying load conditions.
ESP Conditions
Medium to high external static pressures from 100 - 400 Pa (0.4 - 1.6 in.wg), recommended 250 Pa (1 in.wg).
Suitable for projects with extended ducting or complex layouts, including agricultural, hospitals and data server rooms where airflow must be sustained.
Models
With five sizes and 2- or 4-pipe options, the HAHU-B gives you room to scale from smaller zones to complex layouts.
Plus its hybrid design closes the gap between fan coil and AHU, so you don’t have to compromise on performance or practicality.
Installation & Maintenance
Installation and servicing are easy with access to components from the bottom with a lift down panel.
Supplied ready to install, with internal steel drain pan, thick 25 mm (1”)
NBR insulation, manual air vent + water purge valve and G2 (MERV 4) filter.
Capacities
Metric
🍃 Airflow: 1319 – 8257 m3/h
❄️ Cooling: 6.9 – 47.1 kW
☀️ Heating: 7.1 – 48.3 kW
🔊 Sound pressure: from 64 dBA*
Imperial
🍃 Airflow: 799 – 4873 CFM
❄️ Cooling: 33785 – 197100 BTU/Hr | 2.8 – 16.4 Ton
☀️ Heating: 47832 – 306401 BTU/Hr | 4.0 – 25.5 Ton
🔊 Sound pressure: from 64 dBA*
* Sound pressure level measured at 1 m distance in a reverberation test room with the minimum volume of 200 m3.
- Compatible with renewable energy systems – works with solar thermal collectors, heat pumps, and other low-temperature sources for higher energy savings.
- Durable coil design – copper tubes and headers mechanically expanded into corrugated aluminum fins, pressure-tested up to 35 bar with a 16-bar operating limit.
- 0–10 VDC EC motor – delivers up to 30% energy savings compared to AC motors, with smoother speed control, quieter operation, and lower running costs.
- Manual air vent + water purge valve – enables quick and efficient system bleeding for hassle-free maintenance.
- Internal drain pan – in painted steel to safely collect and channel condensate, protecting interiors from leaks, water damage, and moisture issues.
- 25 mm (1”) NBR insulation – double skin thermal barrier that limits heat transfer through the casing, keeping supply air closer to design temperature, especially in humid conditions.
- G2 (MERV 4) filter – captures dust and larger particles to improve indoor air quality and protect the coil.
- I-Type Controllers: Infrared Handset or Wired Wallpad
- Valves: HYDRO+ VALVE Kit with 2/3-way body valve, on-off/modulating actuator (24V or 110-240V), BSPT or NPT connectors, connection piping kit, 2x shut-off valves, strainer and manual balancing valve
- Drain pan: stainless steel
- Electric heater: up to 9 kW
- Filter: G4 (MERV 8) or F8 (MERV 14)
- Air plenum: Supply/Return
- Integrated transformer: converts from 230V to 24V for valve and thermostat compatibility
- Disconnect switch: integrated in control box
- Customization: available upon request (minimum order quantities apply)
Polar Air Control Logic
Polar Air fan coil units provide exceptional control flexibility to meet various application needs. Choose between two types of PCBs.
I-Type Control
Exclusively developed by Polar Air for intelligent control that includes our ADBS technology for ΔT management and group control. Configuration for 2- and 4-pipe models.
Available through ModBus, or compatible with Polar Air Wired Wallpad or Infrared Handset.
24/7 programming
Auto & 3-Speed functions
Sleep function
Auto-Restart function
Dehumidification mode
Adjustable swing louver positioning
Condensate drain pump control
Error diagnostics on unit LED display or Wired Wallpad
Valve control
Dry contact for On/Off applications
Electric heater control
2 x 24V auxiliary contacts for ERVS or dampers
Building Management Systems (BMS) compatible via Modbus
Auto-Dynamic Balancing System with constant ΔT management
255 units group control via ModBus
32 units group control via Wired Wallpad
I-Type Control
Exclusively developed by Polar Air for intelligent control that includes our ADBS technology for ΔT management and group control. Configuration for 2- and 4-pipe models.
Available through ModBus, or compatible with Polar Air Wired Wallpad or Infrared Handset.
24/7 programming
Auto & 3-Speed functions
Sleep function
Auto-Restart function
Dehumidification mode
Adjustable swing louver positioning
Condensate drain pump control
Error diagnostics on unit LED display or Wired Wallpad
Valve control
Dry contact for On/Off applications
Electric heater control
2 x 24V auxiliary contacts for ERVS or dampers
Building Management Systems (BMS) compatible via Modbus
Auto-Dynamic Balancing System with constant ΔT management
255 units group control via ModBus
32 units group control via Wired Wallpad
W-Type Control
Simple yet flexible functionality that is easy to use, allowing for limited LED diagnostics and RPM configuration. Available for 2- and 4-pipe models.
Compatible with external thermostats from a variety of manufacturers.
Choose your own external thermostats
Configure the motor RPMs to your choice
Contact alarm for condensate drain pump and motor
Limited error diagnostics on unit LED display or Wired Wallpad
Project applications & references
Explore recommended applications and recent projects where it’s been successfully installed.
Government
Post Offices · Courthouses · Town Halls · Embassies · Prisons · Military & Emergency Spaces
Healthcare
Hospitals · Clinics · Nursing Homes · Treatment Centers · Laboratories · Morgues
Commercial
Supermarkets · Stores · Shopping Malls · Gyms/Sports Facilities · Museums/Theaters · Airports/Transport Terminals
Industrial
Factories/Plants · Data Centers · Warehouses/Distribution Centers · Wine Cellars/Wineries · Agricultural
Qawra Palace Resort & Spa
2024
Malta
Retrofit · EC motor · hotel banquet halls
Hennep Dispensary
2025
United States
Massachusetts
Retrofit · EC motor · recreational dispensary · Ceairtek brand
Taranaki Hospital
2023
New Zealand
Sheraton Gunter Hotel
2024
United States
Texas
Retrofit · EC motor · hotel facilities
Occidental Railspur
2024
United States
Washington
Retrofit · EC motor · cased model · office complex
Our PASELECT Software is specifically designed to help users choose the most suitable Polar Air fan coils for any project.
Downloads: IOMs, Revits & Guide Specs
Access product resources including installation and operation manuals (IOMs), Revit files, and guide specifications.
Revit Files: HAHU-B_Horizontal Mini AHU_4-pipe
|Size: 5 MB - ENRevit Files: HAHU-B_Horizontal Mini AHU_2-pipe
|Size: 4 MB - ENIOM: HAHU-B Horizontal Mini AHU_METRIC_EC Motor
|Size: 3 MB - EN
Revit Files: HAHU-B_Horizontal Mini AHU_4-pipe
|Size: 5 MB - ENRevit Files: HAHU-B_Horizontal Mini AHU_2-pipe
|Size: 4 MB - ENIOM: HAHU-B Horizontal Mini AHU_IMPERIAL_EC Motor
|Size: 3 MB - ENOur trusted network of authorized representatives ensures you receive exceptional customer service and product availability worldwide.
FAQs: HAHU horizontal air handling fan coil hybrids
When would I choose a hybrid AHU–fan coil instead of a standard fan coil?
A standard fan coil works well in small to medium spaces with short duct runs and straightforward cooling or heating loads. But once a project calls for higher static pressures, long duct layouts, or tighter control of supply air, a fan coil will start to fall short.
The HAHU fills that gap — giving you fan coil flexibility with AHU-level performance, without the footprint or complexity of a full air handling unit. In practice, this means you can use it in projects where you’d normally oversize fan coils or struggle to keep airflow balanced.
How does the HAHU compare to a full AHU?
A full AHU offers maximum capacity, filtration, and air treatment — but it comes with a larger footprint, heavier infrastructure requirements, and higher installation costs.
The HAHU gives you a middle ground: it handles higher ESP (100–400 Pa / 0.4–1.6 in.wg, recommended 250 Pa / 1.0 in.wg) and larger duct networks than any fan coil, but it avoids the bulk, energy demand, and servicing complexity of a full AHU. For many projects, it means you can achieve the performance you need without over-specifying equipment.
Can the HAHU Mini AHU support large indoor buildings?
Yes — that’s where a hybrid model proves its value.
The HAHU is used in hospitals, government complexes, shopping centers, universities, agricultural facilities, and data centers, where airflow needs to stay reliable across large floor areas and varied load profiles.
Its double skin casing with 25 mm (1″) NBR insulation provides the thermal stability required for constant operation, while the service-friendly access reduces downtime in 24/7 environments. In short, it’s sized and designed to handle the challenges of large, complex buildings where ordinary fan coils would struggle.
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