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Laminar Flow and Containment Equipment
Negative-Pressure Weighing Booth
A powder weighing enclosure operated below the surrounding room pressure so air moves inward through the access opening and airborne material stays within the controlled filtration path.
- Negative-Pressure Boundary
- Inward Access-Opening Capture
- Staged Containment Filtration
- Monitored Exhaust Balance
Product Introduction
This booth adds a controlled negative-pressure relationship to the normal downflow weighing layout. Air enters through the open access face, joins the filtered vertical supply and returns through low-level extraction grilles. A monitored exhaust branch maintains the inward boundary while staged filters retain airborne powder. The booth pressure, airflow and building exhaust connection are selected for the material hazard and room arrangement rather than assigned one universal containment value.
Key Features
Inward air at the access opening opposes powder migration into the corridor.
Low-level returns capture powder without directing a strong stream across the balance pan.
Differential-pressure monitoring distinguishes booth pressure from filter loading.
Contained filter-change options reduce contact with collected powder during maintenance.
Customer Product Concerns
Higher-risk powder weighing needs an inward containment boundary without making the balance unstable or exhausting uncontrolled dust downstream.
Powder can escape through the open booth face during container handling.Monitored inward face air carries released dust into the controlled return path.
Strong extraction creates unstable balance readings.A low-turbulence supply and remote low return grilles keep high velocity away from the pan.
Filter loading changes the room-to-booth pressure relationship.Separate pressure sensing tracks filter resistance and the containment boundary.
Maintenance opens contaminated filter compartments to the room.Bag-in/bag-out or other contained change arrangements isolate the loaded filters.
Typical Applications
Potent compound weighingSensitizing powder subdivisionHazardous formulation dispensingContained sample preparation
Technical Parameters
Typical configurable construction ranges for a negative-pressure weighing booth are listed below.
| Core Material | Mineral-wool insulated steel enclosure with SUS316L work-zone liner and staged HEPA filtration housings |
|---|---|
| Panel Thickness | 75-100 mm insulated containment panels |
| Effective Width | 1500-4000 mm clear working width |
| Maximum Length | Up to 6000 mm booth depth |
| Steel Facing Thickness | 1.2-1.5 mm SUS316L internal facing; 1.0-1.2 mm outer steel |
| Core Density | 100-140 kg/m³ high-density mineral-wool core |
| Thermal Conductivity | 0.035-0.045 W/(m·K) for the mineral-wool core |
| Surface Finish | Fine-brushed or electropolished SUS316L internal surfaces with sealed external coating |
| Joint Type | Pressure-sealed flush panel joints with welded return ducts and contained filter-change collars |
| Customization | Available based on the intended application and operating environment. |
Available Options
Recirculating or once-through exhaustBag-in/bag-out filter housingsIntegrated drum lift and weigh tableRoom pressure and airflow display
Planning a Negative-Pressure Weighing Booth specification?
Send us your dimensions, installation conditions, performance targets and required surface finish.
