Laminar Flow and Containment Equipment

Class I Biological Safety Cabinet

An open-front ventilated cabinet that draws room air inward and filters the exhaust to protect personnel and the environment, but not the handled product.

Inward Face Airflow
HEPA-Filtered Exhaust
Personnel and Environmental Protection
Open-Front Access

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Product Introduction

A Class I cabinet uses inward airflow through the front opening to keep aerosols and particles moving away from the operator. The contaminated air passes through an exhaust HEPA filter before discharge to the room or building exhaust system. Because unfiltered room air crosses the work surface, the cabinet does not protect the product from ambient contamination. The sash, inflow monitor and exhaust connection are configured for the intended laboratory use and installation.

Key Features

Continuous inward airflow forms the primary operator-protection boundary.

The exhaust HEPA stage retains particulate contamination before air discharge.

A sloped viewing sash improves visibility while limiting the working opening.

A removable work tray exposes the lower catch pan for cleaning.

Airflow and sash alarms warn when the designed access condition is disturbed.

Customer Product Concerns

The cabinet must protect the operator without being misrepresented as a sterile product-protection device.

Aerosols move toward the operator at an open laboratory bench.Inward face airflow carries them into the filtered cabinet exhaust path.

Users expect the cabinet to keep samples sterile.Clear application guidance states that room air crosses the work surface and product protection is not provided.

A raised sash weakens capture at the opening.A sash-position alarm identifies operation outside the selected access height.

Debris accumulates beneath a fixed work pan.Lift-out work sections expose the stainless lower collection area.

Typical Applications

Aerosol-generating laboratory procedures not requiring sterile product protectionAnimal bedding disposalSample opening under inward captureEquipment enclosure with filtered exhaust

Technical Parameters

Typical configurable construction ranges for a Class I biological safety cabinet are listed below.

Core Material	SUS304 work-zone liner with powder-coated steel outer shell and mineral-wool acoustic exhaust enclosure
Panel Thickness	30-50 mm double-skin cabinet and exhaust sections
Effective Width	900-1800 mm clear working width
Maximum Length	Up to 2200 mm overall cabinet height
Steel Facing Thickness	1.0-1.5 mm SUS304 work-zone liner; 0.8-1.2 mm outer steel
Core Density	80-120 kg/m³ mineral-wool acoustic infill
Thermal Conductivity	0.035-0.045 W/(m·K) for the acoustic infill
Surface Finish	Brushed SUS304 work zone with low-sheen white powder-coated exterior
Joint Type	Welded inner liner with gasketed exhaust-filter housing and adjustable sash tracks
Customization	Available based on the intended application and operating environment.

Available Options

Room exhaust or hard-duct connectionManual or motorized sashStainless or coated-steel exteriorService taps and electrical outlets

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