Waldner Secuflow laboratory fume cupboards

Importance of the topic

Laboratory fume cupboards are essential safety devices for handling hazardous vapors, aerosols and dust. Modern laboratories require containment systems that deliver high protection while minimising energy consumption and providing ergonomic access to complex experiments.

Objectives and overview of the article

This article presents the Secuflow family of fume cupboards by Waldner. It reviews the advanced supportive flow technology, summarises results from international standard testing, and introduces specialised variants for high thermal loads (EN7), dusty substances (Ionic) and recirculating air operation (Green Fume Hood). The focus is on enhanced safety, energy efficiency and practical benefits for laboratory operations.

Methodology

Development combined computational flow analysis, component optimisation and extensive physical testing in a certified facility. Prototypes were evaluated against EN 14175 (parts 3, 4, 6 and 7) and ASHRAE 110 criteria, including tracer gas containment tests at sash openings of 500 and 900 mm. Measurements covered airflow distribution, turbulence, noise levels and energy consumption under both isothermal and high thermal load conditions.

Used Instrumentation

• Secuflow fume cupboard prototypes with supportive flow channels and aerodynamically shaped side posts
• EN 14175 and ASHRAE 110 test rigs with tracer gas detection (SF6 analysers)
• Airflow controllers (FAZ, AC) and sash position sensors for dynamic monitoring
• High-voltage ionisation electrodes module and Neutrodine modular filter assemblies

Main Results and Discussion

• The basic Secuflow achieves reliable containment at only 270 m3/h per linear metre, reducing extract volume by 33% compared with conventional cupboards.
• Supportive flow from the side posts and worktop sill eliminates turbulence and stabilises inflow even with an open sash, maintaining containment below EN 14175 and German BG RCI limits.
• The EN7 variant safely handles internal heating loads up to 4 kW per metre, meeting EN 14175-7 requirements with integrated temperature monitoring and acid-resistant materials.
• The Ionic model uses ionisation of the supportive airflow to neutralise static charges, preventing fine dust adhesion on work surfaces and maintaining high containment for particles down to 1 μm.
• Green Fume Hood recirculates air through a Neutrodine filter system that adsorbs solvents, acids and bases simultaneously, with redundant filters, air quality and acid/solvent sensors, ideal for installations without a dedicated exhaust system.

Benefits and Practical Applications

• Significant reductions in ventilation energy demand and lower investment costs for HVAC systems.
• Enhanced user safety through superior containment under dynamic conditions such as open sash, complex setups and nearby movement.
• Expanded internal workspace and improved ergonomics including inclined controls, Soft Touch panels and modular service outlets.
• Flexible installation options including bench-mounted, low-ceiling configurations and recirculating solutions for retrofit projects in existing laboratories.

Future Trends and Opportunities

Emerging developments include integration of smart IoT monitoring for real-time performance feedback, adaptive airflow management to optimise energy use, and further expansion of specialised modules for applications such as perchloric acid digestion, hydrofluoric acid operations and automated sampling workflows. Sustainable recirculating filter media are expected to support green lab initiatives.

Conclusion

Waldner s Secuflow series establishes a new benchmark in fume cupboard design by aligning aerodynamic innovation with rigorous standard compliance and user-centred features. With dedicated variants for thermal loads, dust control and recirculating operation, Secuflow delivers versatile solutions that enhance safety, reduce costs and support a wide range of laboratory processes.