Providing a reliable fume cupboard airflow issues solution was the main goal of this laboratory upgrade project.
To achieve this, The Fume Cupboard Company carried out a detailed survey. The team assessed how the planned layout changes would affect extract system performance. As a result, the project focused on increasing system capacity and removing airflow restrictions.
The Challenge: Fume Cupboard Airflow Issues
Two laboratories relied on a single extract fan within a Variable Air Volume (VAV) system. However, the system used a diversity setting. Therefore, only a limited number of fume cupboards could operate at full sash opening.
As demand increased, airflow alarms triggered more frequently. Consequently, the system became restrictive. In addition, staff experienced disruption to workflow and reduced usability.
The planned changes included:
- Relocation and installation of walk-in fume cupboards
- Addition of a new unit
- Continued use of the shared extract system
The Solution: Extract Fan Upgrade for Airflow Issues
To resolve the problem, the team recommended an extract fan upgrade.
This upgrade delivered clear improvements. Firstly, it increased the extract air volume. Secondly, it removed the diversity limitation. Finally, it improved overall system performance.
In addition, engineers rebalanced the supply air system. This step ensured stable pressure, correct air replacement, and safe operation across both laboratories.
Performance Upgrade: Improved Airflow Capacity
The upgrade delivered a clear increase in airflow capacity.
Original Fan (2014 – CMV450)
- Airflow: 3.30 m³/s
- Speed: 1225 rpm
- Weight: 255 kg
Upgraded Fan (2026 – CMV500)
- Airflow: 4.16 m³/s
- Speed: 1085 rpm
- Weight: 390 kg
This change increased airflow capacity by 26%. As a result, the system now meets operational demand.
Furthermore:
- The motor size remains the same (2 × 5.5 kW)
- The fan runs at a lower speed, so efficiency improves
- The system pressure stays at 375 Pa
Therefore, the new fan integrates with the existing ductwork without further modification. At the same time, it delivers a complete fume cupboard airflow issues solution.
Lift Day Execution: Installing the Airflow Solution
The lift day marked a key step in the project.
During this stage, engineers installed the new extract fan and connected it to the system. As a result, the upgraded system became fully operational.
This work achieved three key outcomes:
- Increased airflow capacity
- Removal of system restrictions
- Improved future flexibility
Importantly, the team did not carry out a simple replacement. Instead, the upgrade focused on improving performance and capacity.
The Outcome: Airflow Issues Eliminated
The improvements delivered immediate results.
All fume cupboards now operate at the same time. In addition, airflow alarms no longer occur. Therefore, the system now supports normal working conditions.
Key benefits include:
- Full operational flexibility
- Stable airflow performance
- Improved containment confidence
- Increased system capacity
Conclusion: A Complete Airflow Solution
This project shows how a targeted upgrade can deliver a reliable fume cupboard airflow issues solution.
By increasing extract capacity and removing system limits, the laboratory now operates more efficiently. Furthermore, the system is ready for future expansion and increased demand.