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FFU and Terminal Air Purification Equipment
High-Static-Pressure Fan Filter Unit
A reinforced deep-plenum FFU with an oversized EC impeller for applications that must preserve airflow against duct resistance or a heavily loaded final filter.
- Deep Reinforced Pressure Plenum
- Oversized Backward-Curved Impeller
- External Pressure-Test Port
- Extended Filter-Loading Reserve
Product Introduction
The high-static-pressure fan filter unit uses a larger backward-curved EC impeller, deep inlet cone and reinforced plenum to generate more pressure than a standard ceiling module. Structural ribs resist panel movement at the higher operating pressure, and an accessible test port allows the fan operating condition or filter resistance to be checked without opening the clean side. This model is suited to ducted inlets, terminal housings with dense filter packs and rooms where the airflow setpoint must be maintained through a longer loading interval.
Key Features
Formed ribs and reinforced corners limit casing deflection when the plenum operates at elevated static pressure.
A capped pressure port provides a repeatable connection point for commissioning and maintenance measurements.
The EC controller can increase fan speed progressively as filter resistance rises, within the selected operating envelope.
Customer Product Concerns
High-resistance systems lose airflow quickly unless the fan, casing and control range are designed for the full pressure path rather than only a clean filter.
A standard FFU falls below the target face velocity when connected to an upstream duct collar.The larger impeller and deep inlet provide the added pressure reserve needed for duct and fitting resistance.
Filter loading changes the delivered airflow long before the final filter reaches a useful service limit.Variable EC speed and pressure reserve allow airflow to be maintained across a broader resistance range.
Thin plenum panels oil-can or leak at seams under elevated internal pressure.Structural ribs, reinforced corners and sealed folds stabilize the housing at the intended operating point.
Technicians cannot distinguish a loaded filter from an incorrectly set fan without opening the ceiling module.The external pressure-test port permits differential-pressure checks from the service side.
Typical Applications
Duct-connected cleanroom ceiling systemsTerminal ULPA filtrationClean zones with long prefilter intervalsHigh-resistance recirculation modulesProcess areas requiring stable airflow under variable resistance
Technical Parameters
Representative construction ranges for a reinforced high-static-pressure fan filter unit are listed below.
| Core Material | Reinforced aluminium or steel plenum, oversized backward-curved EC impeller and dense HEPA or ULPA mini-pleat filter |
|---|---|
| Panel Thickness | 380-500 mm overall module depth |
| Effective Width | 575-1170 mm nominal ceiling-grid width |
| Maximum Length | Up to 1170 mm standard module length |
| Steel Facing Thickness | 1.0-1.5 mm reinforced steel housing or structural access panels |
| Core Density | Approximately 90-125 kg/m³ nominal compacted density of the high-capacity micro-glass filter pack |
| Thermal Conductivity | Approximately 0.035-0.043 W/(m·K) for the high-capacity micro-glass pack used in the high-static-pressure FFU |
| Surface Finish | Natural anodized aluminium or light-grey powder coating with contrasting pressure-test hardware |
| Joint Type | Reinforced ceiling flange with heavy closed-cell perimeter gasket and gel-seal or compression-seal filter interface |
| Customization | Available based on the intended application and operating environment. |
Available Options
Duct collar or open top intakeHigh-pressure EC motor and impeller selectionFilter differential-pressure portDeep-pack HEPA or ULPA filter with gel interface
Planning a High-Static-Pressure Fan Filter Unit specification?
Send us your dimensions, installation conditions, performance targets and required surface finish.
