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FFU and Terminal Air Purification Equipment
Negative-Pressure HEPA Filtration Unit
A rugged portable negative-air machine that pulls contaminated room air through staged filters and exhausts the HEPA-cleaned airflow through a sealed duct connection.
- Containment Exhaust Flow
- Upstream Prefilter Protection
- Variable Negative Air Volume
- Sealed Exhaust Collar
Product Introduction
The negative-pressure HEPA filtration unit places the prefilter and HEPA cassette upstream of a variable-speed centrifugal blower. Contaminated room air enters the guarded intake, is filtered under negative pressure and then exits through a round exhaust collar for connection outside the contained space or to an approved return path. A differential gauge indicates filter resistance, and gasketed access panels maintain the dirty-side pressure boundary. When operated without an exhaust duct, the same unit functions as a recirculating air scrubber but does not create room negative pressure.
Key Features
A sealed round outlet accepts flexible ducting for controlled exhaust from the contained room.
Variable blower speed supports pressure adjustment as room leakage and filter resistance change.
Separate coarse and intermediate filters protect the HEPA stage during high-dust work.
Customer Product Concerns
Containment requires more than HEPA recirculation: the filtered airflow must leave the room through a controlled path at a rate greater than incoming leakage.
A portable purifier cleans air but leaves the room at neutral pressure.The sealed exhaust collar routes filtered air outside the contained space to create a pressure deficit.
A leak on the dirty side can discharge contaminated air around the HEPA filter.The upstream filter arrangement keeps dirty compartments under suction during operation.
Heavy construction dust rapidly loads the expensive final filter.Replaceable coarse and intermediate prefilters capture high-mass particles first.
Negative pressure falls as the filters load or the enclosure leakage changes.The variable blower and filter gauge allow airflow to be adjusted while resistance is monitored.
Typical Applications
Isolation and containment roomsCleanroom maintenance enclosuresLaboratory renovation zonesPharmaceutical dust containmentTemporary controlled exhaust
Technical Parameters
Representative construction ranges for a portable negative-pressure HEPA filtration unit are listed below.
| Core Material | Variable-speed centrifugal blower with coarse prefilter, intermediate stage and upstream micro-glass H13-H14 HEPA filter |
|---|---|
| Panel Thickness | 500-900 mm enclosure depth |
| Effective Width | 500-900 mm cabinet width |
| Maximum Length | Up to 1300 mm overall unit height or longest cabinet dimension |
| Steel Facing Thickness | 1.0-1.5 mm dark-blue powder-coated steel or lightweight aluminium enclosure |
| Core Density | Approximately 90-120 kg/m³ compacted density of the HEPA pack used in the negative-pressure filtration cabinet |
| Thermal Conductivity | Approximately 0.035-0.043 W/(m·K) for the HEPA pack used in the negative-pressure exhaust path |
| Surface Finish | Dark-blue chemical-resistant powder coat with black intake grille and stainless corner hardware |
| Joint Type | Gasketed negative-side filter door with positive-lock cassettes and sealed round exhaust duct flange |
| Customization | Available based on the intended application and operating environment. |
Available Options
Single or multi-stage prefiltrationHEPA H13 or H14 final filterRound exhaust duct adaptersCaster frame or stackable skid
Planning a Negative-Pressure HEPA Filtration Unit specification?
Send us your dimensions, installation conditions, performance targets and required surface finish.
