Specialty fan coils

The specialty fan coil range is engineered for high-demand, non-standard environments, including healthcare, industrial, government, and agricultural buildings that require customizable airflow, and enhanced thermal insulation.

Our specialty fan coils are designed for niche, high-performance applications where standard solutions fall short. Designed for demanding environments like healthcare, government, industrial, and agricultural facilities, they offer robust performance, thermal stability, and customizable airflow to suit complex, project-specific requirements.

The range includes a Double Skin Ducted Unit (PDWD) with thermal-barrier casing to minimise energy transfer, ideal for hot or humid climates. Also available are hybrid mini air handling/fan coil units (HAHU-B Horizontal and VAHU Vertical) that combine the efficiency of fan coils with the versatility of AHUs.

Available in 2- and 4-pipe models, with EC motors, and multiple coil row configurations to improve heat exchange, latent capacity, and humidity control. These specialty fan coils are installation- and maintenance-friendly, with internal steel drain pans, 25 mm PU insulation, and thoughtful design features to simplify servicing and commissioning.

Ideal for renewable energy systems

Our fan coils are compatible with heat pumps or solar thermal collectors for ultra-efficient heating and cooling.

FAQs: speciality application

ESP selection depends on the length and complexity of your ductwork. High-static-pressure units, such as the HAHU-B or PDWD, are recommended for installations with long duct runs, multiple bends, or high-resistance grilles. See below for a breakdown of the range and recommended conditions:

PDWD Double Skin: For high external static pressures up to 200 Pa / 0.8 in.wg. Recommended: 150 Pa / 0.6 in.wg.

HAHU-B Horizontal Mini AHU: For high external static pressures up to 400 Pa /1.60 in.wg. Recommended: 250 Pa / 1 in.wg.

VAHU Vertical Mini AHU: For high external static pressures up to 200 Pa / 0.8 in.wg. Recommended: 150 Pa / 0.6 in.wg.

Selecting the wrong ESP can lead to insufficient airflow at terminal outlets, reduced system efficiency, and occupant discomfort. Always calculate total external pressure losses before specifying the unit.

If you need further help, please consult our PASELECT Software.

Yes. Most specialty fan coil and mini-AHU units, including those in the Polar Air range, support BMS integration via standard protocols (such as Modbus). This enables centralized control of temperature, fan speed, and scheduling, which is critical for large-scale facilities such as hospitals or industrial plants, where zone management and energy tracking are essential.

Specifying fan coils for industrial or large-format spaces (like factories, warehouses, agricultural processing plants, or airport terminals) requires attention to external static pressure demands, part-load performance, maintenance access, and air quality risks.

For spaces with long duct runs, multiple outlets, or filtration requirements, units with high ESP capability (e.g. 200–400 Pa) are critical to maintaining consistent airflow and meeting design air-change rates. Environments with dust, humidity, or airborne particulates require fan coils with internal steel drain pans, PU insulation, and optional upgraded filtration to ensure durability and hygiene compliance.

EC motors should be specified for their ability to handle variable airflow loads, particularly in spaces with shifting thermal loads or large open volumes. In retrofit installations or low-service-clearance zones, bottom-access or vertically accessible units reduce maintenance time and avoid service conflicts with overhead equipment or production infrastructure.

The key difference lies in the orientation and application style: the HAHU-B is designed for horizontal ceiling-mounted installations, while the VAHU is for vertical, floor-mounted setups. Both are part of the specialty range and share features like 220V/1-phase compatibility, making them ideal for projects without access to 3-phase power.

HAHU-B – Horizontal Air Handling Unit:

  • Designed for ceiling voids or above-service areas.
  • Bottom-accessible filter and fan blower, allowing maintenance from below, critical in dense ceiling spaces.
  • Operates on 220V single-phase, unlike many mini AHUs, which require 380V/3-phase.
  • Ideal for low-ceiling or space-constrained applications with high static pressure needs.

VAHU – Vertical Air Handling Unit:

  • Floor-mounted configuration with top or downflow air distribution.
  • Maintenance access from the front, with no overhead lifting or panel removal required.
  • Significantly faster to install than ceiling-suspended AHUs.
  • Also supports 220V single-phase, simplifying use in commercial or government retrofit projects.

Together, they offer engineers application-specific flexibility depending on ceiling height, floor space availability, and power infrastructure constraints.

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