SBT Laboratories provides comprehensive fume cupboard testing and validation to both the European EN14175standard or the American ASHRAE 110 standard dependant on the customers’ requirements.
Unplanned Maintenance and Repairs
Our team of skilled technicians can fault find all common makes and models of fume cupboards and resolve any fault that they may find preventing the safe use of the unit, common problems that we are often called to resolve include:
- Fan motor failures due to weather damage
- Corrosion to mechanical components
- Airflow alarms requiring calibration
- Gas and water leaks
- Damaged work surface seals
- Damaged and leaking ductwork
- Jammed sash systems
- Faulty airflow sensors
- Broken sash glass
A well-executed planned maintenance program can ensure the safety of operators and significantly reduce the frequency and duration of unplanned stoppages by repairing or replacing worn or damaged parts before they impact the safe operation of the fume cabinet.
Face Velocity Testing
The most common means of fume cupboard testing to check performance is to conduct a face velocity test in accordance with either ASHRAE 110 or EN 14175-4. The aim of the test is to determine any variation from the commissioning test results if available or to ensure that face velocities remain above the 0.5 m/s minimum guideline provided by the standard. For each position within the grid of measurements a mean velocity taken over a period of at least 30 seconds is recorded, the mean velocity of each no position should vary by no more than 10% from the average reading.
Another important test which is required by both the EN and ASHRAE standards is the airflow visualisation, here a controlled amount of smoke is generated using a smoke stick which is used to visualise the airflow patterns around the face of the fume cabinet as well as internally as specified by the standard.
Particular attention is paid to the affects that external draughts caused by open doors and windows or other ventilation equipment such as air conditioners have on the airflow patterns. Any reflux of the smoke would immediately result in the unit failing and require the technician to find the source of the disturbance and correcting the problem.