Fan Coil Units

A fan coil unit is the room-level terminal in a chilled water HVAC system: a small casing holding a coil, a fan, and a filter, fed by chilled or hot water piping from a central chiller or boiler plant rather than running its own refrigeration circuit. Room air passes over the coil, drops or gains temperature, and returns to the space either through a short duct run with grilles or as a direct free-blow from a ceiling cassette or wall-mounted unit. Because the cooling or heating source sits centrally, FCUs are the standard terminal choice on hotel guest rooms, hospital patient rooms, and residential apartments where each room needs its own thermostat and fan speed control but a central chiller plant does the actual refrigeration work.

FCU selection is driven by the room's sensible and latent cooling load, the water flow temperature the central plant delivers, and the physical constraint of the ceiling void or wall space available. Cassette units sit flush in a ceiling grid and blow in four directions, suited to open-plan rooms with a false ceiling. Ceiling-concealed ducted units sit above the ceiling and connect to short duct runs with diffusers, giving more flexibility on where supply air lands in an irregular room shape. Vertical (floor-standing or wall-mounted) units suit rooms without a false ceiling, common in some hotel refurbishment and residential retrofit work. Coil rows and water flow rate get sized against the specific chilled water supply temperature the project's chiller plant delivers, since a plant running at 7°C supply needs a different coil selection than one running at 10°C for a lower approach temperature strategy.

Saudi hotel and residential tower projects typically run large FCU counts, often several hundred to a few thousand units across a tower, which makes standardization across a small number of capacity steps and consistent water-side balancing valve selection a real factor in commissioning time and long-term maintenance rather than a procurement convenience. Hospital patient room FCUs carry the added requirement of easily cleanable coil and drain pan surfaces given infection-control housekeeping standards.

Sourcing runs from a room-by-room load schedule and the chiller plant's water temperatures. A project team sends cooling load per room, unit type preference (cassette, ducted, or vertical), and water supply/return temperature, and NLS returns unit selection and a priced quote in USD, with lead time set by total unit count and whether the order matches a standard capacity range or needs a custom split across multiple capacities.