Waldner Secuflow EN7

Significance of the topic

The handling of high thermal loads and aggressive acids in modern laboratories demands fume cupboards that ensure both operator safety and energy efficiency. Compliance with evolving safety standards such as EN 14175-7:2012 enhances risk management when working with heat sources and corrosive vapours, while optimized airflow technologies reduce operating costs and environmental impact.

Study objectives and overview

This whitepaper presents the design, testing and performance of a new series of bench-mounted fume cupboards (Secuflow EN7) tailored for high thermal loads and acid digestions. Key goals include:

• Meeting the requirements of EN 14175-7 for special-purpose applications.
• Maintaining stable containment under heat sources up to 4 kW/m inner width.
• Reducing extract air volumes to lower energy consumption.
• Ensuring chemical resistance for perchloric, hydrofluoric and other strong acids.

Methodology and instrumentation

Design and testing followed systematic airflow investigations in a certified laboratory, applying:

• EN 14175 – Parts 3, 4, 6 and 7 for fume cupboard performance.
• BSR/ASHRAE Standard 110P-2005 for tracer gas containment tests.
• Integrated temperature sensors and alarms to monitor internal heat levels.
• Active supportive flow (Secuflow) technology with variable airflow control (Airflow Controller AC).

Main results and discussion

Tests demonstrated that the Secuflow EN7 series achieves safe containment even with heat sources of 4 kW per metre and during acidic digestions. Key findings include:

• Energy savings of up to 40 % through reduced extract air volumes compared with conventional fume cupboards.
• Stable down-draught profiles under thermal loading, preserving operator protection.
• Rapid temperature alarm response and integration with building management systems.
• Chemical-resistant internal linings (polypropylene, stoneware) compatible with perchloric and hydrofluoric acids.

Benefits and practical applications

The integration of Secuflow EN7 technology offers multiple advantages for QA/QC, research and industrial labs:

• Lower HVAC installation and operating costs due to optimized airflow.
• Enhanced safety margin when processing hot samples or strong acids.
• Flexible configuration for vacuum, gas and water service modules.
• Applicable to thermal digestions, perchloric acid work and hydrofluoric acid handling.

Future trends and applications

Advances in fume cupboard technology are expected to focus on real-time monitoring, remote diagnostics and closed-loop control systems. Potential developments include:

• Integration with IoT platforms for continuous performance tracking.
• Energy recovery modules to reuse exhaust heat.
• Adaptive airflow strategies based on user behaviour and process demands.
• Modular designs for rapid reconfiguration between standard and special-purpose fume cupboards.

Conclusion

The Secuflow EN7 bench-mounted series sets a new benchmark in containment performance for high thermal and acidic applications, balancing stringent safety requirements with significant energy reductions. Adoption of EN 14175-7 compliant designs ensures laboratories can meet current and future regulatory demands while controlling operating costs.