Three-quarter view of the white cleanroom recirculation air unit with an upper perforated grille, blue lower grille, control panel and side pipe connections

FFU e equipamento de purificação de ar terminal

Unidade de Recirculação de Ar em Sala Limpa (RCU)

A local return-air cabinet for recirculating filtered room air, with a cooling-section option when the clean zone also needs removal of equipment heat.

Local Return-Air Cabinet
Optional Cooling Section
Accessible Filter Stages
Airflow and Temperature Choices

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Introdução do produto

The cleanroom recirculation air unit brings the return-air intake, fan and filtration components into a local service cabinet. A cooling section can be added when heat must be removed from the recirculated stream. The illustrated cabinet separates access to the lower return section from the upper supply area, with external pipe connections for a water-coil arrangement. Front discharge and short-plenum supply layouts allow the air circuit to be arranged around an individual room or equipment zone rather than a remote central return path.

Características-chave

Short local circulation path

Return and supply connections can serve the same process zone without routing the full recirculation volume through a distant air handler.

Cooling is a separate selection

A water-coil package can address equipment heat while the fan is selected around the required filtered-air volume.

Accessible loading stages

A planned prefilter service route helps keep routine coarse-dust removal separate from final-filter replacement.

Defined water and drain interfaces

Pipe-side connections and the chosen condensate arrangement can be coordinated without using the air outlet as a service opening.

Soluções para sua aplicação

An RCU must balance the room air path, process heat and maintainability rather than treating them as one fan-speed setting.

Clean supply air returns directly into the cabinet intake.Separate the return and discharge locations and check the room circulation pattern to reduce short-circuiting around the unit.

The process heat load changes without a matching change in particle generation.Select separate fan and coil-valve control so cooling demand need not determine the required filtration airflow.

A wet cooling section is difficult to inspect.Reserve access to the pan, coil and drain connection and choose a cleaning route that does not expose the final filter to liquid.

Prefilter loading gradually changes the delivered room air volume.Provide an accessible replacement stage and optional pressure indication, then check airflow after servicing or changing the filter type.

Aplicações típicas

Local electronics production zonesQuartos de apoio farmacêuticoLaboratory controlled environmentsPrecision manufacturing areas with equipment heatCleanroom return-air upgrades

Parâmetros técnicos

The following common cabinet references and component choices support initial selection of a compact recirculation system.

Typical Compact Cabinet Envelope	Approximately 500–800 mm wide × 600–800 mm deep × 1200–1700 mm high; larger cooling and filter sections use a custom enclosure
Common Recirculation Selection Band	Approximately 1000–2000 m³/h for compact local systems, depending on the selected filter and airflow layout
Housing Material Options	Powder-coated steel or aluminium cabinet; stainless-steel wet-section components as an option
Fan Configuration	Variable-speed EC centrifugal fan assembly
Common Electrical Supply	230 V AC, single phase, 50/60 Hz variant
Prefiltration	Accessible coarse or fine prefilter ahead of the selected cooling and final-filtration stages
Common Final-Filter Options	HEPA H13 or H14; alternative process filtration available
Cooling Option	Chilled-water coil with separate water connections and valve-control package
Condensate Arrangement	Drain pan and connected drain for wet-coil operation; dry-coil configuration available for appropriate water temperatures
Controls and Monitoring Options	Fan-speed control, filter differential-pressure indication and independent temperature/coil-valve regulation
Supply Arrangement Options	Front discharge grille or connection to a local supply plenum
Customização	Disponível com base na aplicação pretendida e no ambiente operacional.

Opções disponíveis

Fan-and-filter cabinet or added cooling sectionFront grille or short-plenum supplyAlternative prefilter and final-filter combinationTemperature sensor and modulating water valvePressure indication and compatible network control

Define which coil, water-side parts, sensors and controls are included. A circulating fan/filter cabinet does not include a chilled-water source unless separately selected.

Selection and Installation

Size the air circuit before choosing the cabinet

Use the compact cabinet and recirculation references as starting points, then identify the room volume, particle sources, return location and available discharge path. The cabinet shown is a vertical arrangement; ceiling modules and floor cabinets with similar air volumes are not dimensionally interchangeable. Confirm door swing, filter withdrawal space, pipe projections and the route for moving the assembled unit into position.

Separate the cooling duty from the air-cleaning duty

Describe the process heat load, entering air condition, target room temperature and available water temperatures and flow. Select the coil at those conditions and include fan heat in the balance. An airflow adjustment is not a substitute for temperature regulation; specify whether the valve, sensor, actuator and controller are included. Do not combine one reference unit's cooling capacity with another unit's airflow or power rating.

Plan condensation control and access

A coil below the air dew point needs a drain pan, an appropriate trapped drain and insulated water connections. A dry-coil arrangement depends on the actual dew point and water-temperature control, not simply the absence of a drain connection. Reserve access for cleaning the coil face and removing the prefilter without wetting the final filter or electrical parts.

Keep ventilation and contamination duties distinct

Recirculation does not supply the outdoor air needed for occupants, remove all process gases or replace the room's pressure-control system. Identify any separate make-up and exhaust streams and avoid recirculating hazardous process emissions. This RCU is not a dehumidifier or an ultra-low-dew-point dry-room system by default. If heat removal is unnecessary and the requirement is a ceiling supply point, compare the standard fan filter unit.

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