Fan Coil Unit Supplier
for Commercial HVAC Projects

A fan coil unit is an HVAC terminal unit that uses a fan and a heat-exchange coil to condition indoor air. Chilled water or hot water flows through the coil, the fan moves room air across it, and conditioned air is supplied back into the room or zone.

Fan coil units are commonly connected to a central chilled-water system fed by an air-cooled or water-cooled chiller, heat pump or central plant. In many commercial buildings, AHUs handle fresh air and large ventilation loads while FCUs handle local zone cooling and heating.

Cassette

Cassette FCU — FP-KM Series

340–1360 m³/h · 1.9–7.8 kW · ≤38–47 dB(A)

Suspended ceiling 360° air supply Hotel / Office

View Cassette FCU

Concealed

Concealed FCU (Ducted)

340–2380 m³/h · 1.8–12.85 kW · 37–54 dB(A)

Ceiling void 2-pipe / 4-pipe Premium install

View Concealed FCU

Exposed

Exposed FCU (Surface-Mounted)

340–2380 m³/h · 1.8–12.85 kW · 37–54 dB(A)

No ceiling needed Retrofit School / Clinic

View Exposed FCU

Cooling capacities rated at 7°C chilled-water inlet; heating at 60°C hot-water inlet. Final capacity should always be confirmed at the project’s actual water and entering-air conditions.

The cassette range is ceiling-mounted with a decorative panel and 360-degree air supply, making it suitable for rooms with finished suspended ceilings. SongXin states up to 15% higher heat-transfer efficiency than conventional cassette coils, and the range is rated for a typical coverage of roughly 50–200 m² depending on load and ceiling height.

Before selecting a cassette unit, verify ceiling void depth, condensate pump requirement, panel dimensions and air throw.

ISO 9001 ISO 14001 CE AHRI RoHS 3C

Cooling/heating figures are nominal ranges across fan speeds. Lower noise = low-speed operation — the recommended design point for hotels and quiet spaces.

Fan coil units are widely used in commercial and light-industrial HVAC systems where each room or zone needs individual temperature control. In most projects, the AHU treats fresh air while FCUs handle local comfort.

Choose a cassette unit when the room has a suspended ceiling and the design allows a visible ceiling panel with broad multi-direction air distribution. Choose a concealed unit when the indoor equipment must be hidden above the ceiling and connected to grilles or short ducts — but confirm available static pressure and access panels first. Choose an exposed unit when ceiling space is limited, installation must be simple, or maintenance access matters more than hidden appearance.

For current product details, see SongXin’s terminal unit range, including cassette, concealed and exposed fan coil units.

A professional FCU quotation checks cooling capacity at the real project condition, not only at a catalogue rating point. Actual output changes with entering-air temperature, relative humidity, chilled-water supply temperature, water flow, fan speed and coil cleanliness. SongXin rates its FCU cooling at a 7°C chilled-water inlet; if your project uses a different supply temperature, delivered capacity will differ.

For chilled-water projects, a simple water-side check can be used at early stage:

Example: An FP-KM-34 is rated ~1.9–2.2 kW cooling. With a 5°C chilled-water ΔT, approximate water flow = 2.0 ÷ (1.163 × 5) ≈ 0.34 m³/h — consistent with published water-flow range for small units. This is only an early check; final selection uses the performance table at real entering-air and water conditions.

The supplier should clarify whether the listed capacity is total cooling, sensible cooling or heating. In humid climates the sensible heat ratio matters, because a unit that meets total capacity may still leave the room too humid.

Airflow and air throw decide whether the room feels comfortable after installation. Too much airflow can be noisy or drafty; too little leads to slow, uneven cooling. For concealed ducted units, confirm available external static pressure at the selected airflow.

On the water side, FCUs are part of a chilled-water loop and must be coordinated with the chiller capacity, pump flow, pipe sizing, balancing valves and control valves. Key items to confirm:

• Chilled-water supply/return temperature and total FCU water flow
• Coil and valve pressure drop; 2-pipe or 4-pipe design
• Valve control type and condensate drain routing
• Pump sizing — ignoring FCU pressure drop can lead to an undersized pump
• Balancing — ignored balancing creates uneven cooling, even when the model is correct

• Buying by nominal capacity only. Capacity changes with water temperature, entering air, airflow and coil design. A catalogue number does not guarantee room comfort.
• Ignoring noise. Noise is the most common comfort complaint in hotels and bedrooms. Compare sound level at the fan speed likely to run in service, not at maximum airflow.
• Poor condensate drainage. Wrong drain slope, blocked lines or missing pumps cause ceiling damage — especially with concealed and cassette units.
• Not confirming external static pressure. Ducted concealed units need enough ESP, or airflow will be weak after installation.
• No maintenance access. Filters, coils, valves and drain pans need service space; hidden units without access panels become expensive to maintain.

SongXin has manufactured commercial and industrial HVAC equipment since 2009, with multiple production bases, national-level testing laboratories (verified from −40°C to +55°C) and more than 100 patents. For buyers, this translates into verifiable quality:

For humid climates such as the Middle East, Africa and Southeast Asia, SongXin also advises on drain-pan insulation, pipe insulation and low-speed selection to control condensation and noise.

Professional buyers should expect documents that make a quotation verifiable. SongXin can provide:

Many FCU failures come from installation, not factory quality. Before handover:

• Confirm model and orientation; check chilled-water connections and flush pipework
• Confirm water flow and valve operation
• Verify condensate drain slope and pump operation if used
• Clean the filter before testing; measure supply-air temperature at a typical operating condition
• Confirm fan-speed and thermostat response; inspect for vibration, abnormal noise and leakage
• For multi-room projects, sample rooms near and far from the pump, on different floors and with different solar exposure

Author: SongXin HVAC engineering content team. Updated: July 1, 2026. Technical review: fan coil unit selection and export documentation reviewed by SongXin HVAC application engineering.

Published FCU capacity, airflow, water-temperature and sound discussions should be checked against the project selection table before procurement. The external standards below are used as engineering references; project compliance still depends on the local code, tender specification and final approved submittal.

• AHRI 440/441 for fan-coil performance rating terminology and published-rating context.
• ANSI/ASHRAE Standard 62.1 for ventilation and indoor-air-quality design context in commercial buildings.
• SongXin certification and compliance records for company-level ISO, CE, AHRI, RoHS and 3C evidence used on this page.