Industry-Specific Cleanroom Equipment

Negative Pressure Weighing Booth

An open-front downflow booth that combines HEPA-filtered vertical air supply with low-level returns and slight negative pressure for cleaner powder weighing and dispensing.

Vertical HEPA Downflow
Low-Level Dust Capture
Open-Front Access
Monitored Negative Pressure

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Product Introduction

The negative pressure weighing booth forms a localized clean-air zone around balances, containers and manual dispensing work. Filtered air descends from the overhead diffuser and carries liberated particles toward low-level rear returns, while a controlled exhaust fraction keeps the booth below the surrounding room pressure. Stainless interior panels, flush lighting and accessible filter sections support cleaning and routine airflow verification.

Key Features

Uniform downward airflow moves airborne powder away from the operator breathing zone.

Three low rear returns capture particles close to the work surface.

Partial exhaust establishes inward flow across the open booth face.

A flush control screen displays fan, pressure and filter-condition information.

Customer Product Concerns

Manual weighing can release fine powder at the balance and container rim, creating operator exposure and cross-contamination risks.

Dust can rise into the operator breathing zone during pouring.Vertical filtered downflow sweeps particles toward returns below the working height.

An open work face can allow powder to escape into the cleanroom.A controlled exhaust fraction maintains inward air movement across the booth opening.

Obstructed returns create unstable airflow around equipment.Multiple low-level grilles spread capture across the rear wall and simplify placement planning.

Filter loading may go unnoticed between service intervals.Differential-pressure monitoring provides a visible indication of changing filter resistance.

Typical Applications

Raw-material weighing and dispensingAPI sampling and subdivisionPowder container chargingPharmaceutical compounding support

Technical Parameters

Typical configurable construction values for an open-front pharmaceutical weighing booth are listed below.

Core Material	304 stainless-steel enclosure with HEPA terminal filters and perforated supply diffuser
Panel Thickness	50-100 mm insulated plenum and wall sections
Effective Width	1400-3000 mm clear working width
Maximum Length	Up to 4000 mm overall booth length
Steel Facing Thickness	1.0-1.5 mm stainless interior facing
Core Density	35-45 kg/m³ for insulated wall and plenum fill
Thermal Conductivity	0.035-0.045 W/(m·K) for insulated enclosure sections
Surface Finish	Brushed or satin stainless interior with smooth sealed joints
Joint Type	Sealed modular wall and plenum joints with open-front pressure boundary and low-level return grilles
Customization	Available based on the intended application and operating environment.

Available Options

Integrated weighing table or floor scale recessSafe-change exhaust filtrationAlternative booth widths and depthsAirflow, pressure and particle monitoring interfaces

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