Heat Recovery Air Handling Unit
FAH-J Series
A fresh-air handling unit with built-in heat recovery: it brings 100% outdoor air into the building while reclaiming energy from the exhaust air, so fresh air no longer drives up your cooling load — from offices to pharmaceutical plants. From compact ceiling-hung units to large modular systems — built on FRIMEC's founding belief that science can make a better world.
Explore How the FAH-J Benefits Your Building
Recovers the Energy
A built-in heat exchanger pre-cools incoming fresh air with outgoing exhaust air.
Learn more → 02100% Fresh Air
Mechanical supply and exhaust keep indoor air fresh without wasting conditioned energy.
Learn more → 03Scales to Any Building
Compact FAH-J units up to 10,500 m³/h and modular FCAH systems up to 50,000 m³/h.
Learn more →Fresh Air In, Energy Kept In
Built-in Total Heat Exchanger
In summer the exchanger transfers heat from incoming fresh air to the outgoing exhaust air, pre-cooling the fresh air; in winter it works the other way round.
- Temperature efficiency above 70%, enthalpy efficiency above 60%
- Total-heat core also recovers moisture while blocking pollutant molecules
- Available as total-heat or sensible-heat version
- Parallel-flow or cross-flow, left- or right-hand layout
100% Fresh Air, Supply & Exhaust
Dedicated supply and exhaust fans deliver a balanced flow of 100% outdoor air, with a flexible outlet layout that is easy to design and install.
- Airflow 1,000 – 10,500 m³/h (FAH010 – FAH105)
- Supply external static pressure up to 160 Pa
- Ceiling-hung type (010–040) and horizontal type (050–105)
- Sound level 53 – 66 dB(A)
Cooling & Heating Built In
Choose chilled-water and hot-water coils to suit the project, or a coil-free fresh air ventilator version.
- Total cooling 11.1 – 125.3 kW with 2-row chilled-water coil
- Up to 162.6 kW with 4-row chilled-water coil
- Optional 1- or 2-row hot-water coil for heating
- Fresh air ventilator version without coil: 6.9 – 72.1 kW
Rotary Wheel — Up to 80% Total Heat Efficiency
A honeycomb wheel of coated aluminium foil stores and releases both heat and moisture as it turns between the fresh-air and exhaust streams.
- Total heat efficiency up to 80%
- Exhaust carry-over to fresh air below 0.4%
- Self-cleaning counter-flow and bidirectional purge structure
- Only 200 mm thick; service life up to 10 – 15 years
Plate Exchanger — No Moving Parts
A corrugated aluminium-fin core transfers heat without any heat medium, power source or moving part.
- Temperature efficiency up to 72%
- Independent air channels with low leakage prevent cross-contamination
- Simple construction and simple maintenance
- Airflow 2,000 – 30,000 m³/h, cooling 27 – 412 kW
Glycol Loop — Zero Cross-Contamination
An ethylene-glycol circuit carries energy between separate fresh-air and exhaust units, so the two air streams never meet.
- Fresh air stays completely free of exhaust pollution
- Supply and exhaust units can be placed independently
- Glycol solution protects the system against freezing
- Airflow up to 50,000 m³/h, cooling up to 705 kW
Starter Cabinets & BA Integration
FRIMEC supplies the control cabinet that matches the site power grid and the building management needs.
- Direct starter, star-delta (recommended for motors ≥ 11 kW)
- Variable-frequency or soft-starter cabinet for sensitive grids
- Local, remote and BA control options
- Fan / fire-valve and fan / air-valve interlock
Where the FAH-J Performs Best
Wherever a building must bring in large volumes of fresh air, the FAH-J range removes most of the energy penalty that comes with it.
Pharmaceutical Manufacturing
Production areas that run on large volumes of fresh air recover most of that energy; plate and heat-medium recovery keep fresh and exhaust air fully separated against cross-contamination.
Airports, Exhibition Halls & Malls
Modular FCAH units up to 50,000 m³/h handle the high fresh-air volume of crowded public spaces.
Offices & Commercial
Continuous fresh air for occupants.
Hotels & Apartments
Fresh air for rooms and corridors.
Hospitals & Laboratories
Heat-medium recovery keeps air streams fully apart.
Schools & Campuses
High-occupancy classrooms and lecture halls.
Meeting Halls & Auditoriums
Ballrooms, theatres and conference rooms.
Factories & Workshops
Ventilation for production areas.
Additional Plus-Point Features
Lower Life-Cycle Cost
Smaller chillers, cooling towers, pumps and pipework often offset the extra cost of the unit.
Optional Wet-Film Humidifier
50 – 200 mm wet-film section, up to 64 kg/h humidifying capacity.
Total or Sensible Heat
Choose total-heat recovery for moisture control or sensible-heat for simpler duty.
Transition-Season Bypass
Fresh air can bypass the recovery core when outdoor conditions are already favourable.
Flexible Fan Arrangement
Supply and exhaust fan positions selectable to protect fresh-air quality.
Easy Maintenance
Few moving parts; after the first three months, inspection about once a year.
Specification Summary
| Series | FRIMEC FAH-J Heat Recovery AHU · FCAH Modular Heat Recovery AHU |
|---|---|
| Airflow | FAH-J 1,000 – 10,500 m³/h · FCAH 1,400 – 50,000 m³/h |
| Heat recovery | Built-in total / sensible heat exchanger (FAH-J) · Runner · Plate · Heat medium (FCAH) |
| Recovery efficiency | FAH-J: temperature > 70%, enthalpy > 60% · Runner: total up to 80% · Plate: 72% · Heat medium: 50% |
| Cooling capacity | FAH-J 11.1 – 162.6 kW (2 / 4-row coil) · FCAH 20 – 705 kW |
| Unit type | FAH-J ceiling-hung / horizontal · FCAH ceiling-hung / horizontal / vertical |
| External static pressure | FAH-J supply 40 – 160 Pa · FCAH ≥ 300 Pa |
| Power supply | 380 V |
| Sound level | FAH-J 53 – 66 dB(A) |
| Casing (FCAH) | 25 / 35 / 50 mm wall thickness |
| Control options | Direct, star-delta, VFD or soft starter · Local, remote and BA control · Interlocks |
| Humidifier (optional) | Wet film, 50 / 100 / 150 / 200 mm |
Cooling rated at fresh air 35 °C DB / 28 °C WB, return air 27 °C DB / 19.5 °C WB, chilled water 7 / 12 °C; heating with hot water 60 / 50 °C. Specifications are subject to change without prior notice.