Our range of service solutions to cater for client specific needs, from single visits to long term service contracts covering multiple sites all over the UK & Ireland. We pride ourselves on offering a comprehensive service to safeguard your employees.

Why should you have a service?

COSHH Regulations dictate that Local Exhaust Ventilation (Fume Containment) equipment should be checked and certified every 12 to 14 months and the results should be recorded, irrespective of the amount of usage the cabinet has received. BS EN 14175 detail these specific requirements, and the safeguards contained in BS 7258-3:1994 regarding maintenance at 12 monthly intervals are also retained in these updated standards.

We can advise on product suitability for changes of application or arrange maintenance visits to ensure your investment remains in perfect working order.

Not only are you maintaining certification of the cabinet, you are also maintaining that the cabinet is safe to use.

Contact us for a no obligation review of your current site facilities and a detailed quotation.

Monmouth Scientific | Service & Maintenance | Fume Cupboard

Recirculating Fume Cupboards 

The current British Standard for Filtration Fume Cabinets; BS7989:2001, gives detailed requirements regarding the regular testing of this equipment.

Tests that should be carried out and recorded as standard include:

  • Overall Inspection, including electrical systems
  • Airflow velocity check – with calibrated instrumentation
  • Containment test – using smoke tubes
  • Carbon Filter Saturation Test – using Propanol and hotplate*
  • Particulate Filter Test – using smoke generator and photometer*
  • Tests marked with * are often omitted by some service companies to save costs, time and avoid their expense of having to invest in test equipment.

Ducted Fume Cupboards 

Tests that should be carried out and recorded as standard include:

  • Overall Inspection, including electrical systems
  • Airflow velocity check and adjustment – with calibrated instrumentation
  • Containment test – using smoke tubes
  • Complete ductwork check for leaks and damage
  • Checking external fan for weather ingress and safe operation
  • Checking of all sash wires to ensure corrosion free

When servicing/calibrating/validating a Laminar Flow Cabinet it is important to check all aspects of a cabinet:

  • Interior condition checked
  • Exterior condition checked
  • Access flaps and hinges checked
  • Lights checked
  • Switches checked
  • Fan condition checked
  • All seals checked for integrity by DOP where accessible
  • Pre-filters replaced if necessary
  • HEPA filters challenged for integrity by DOP smoke test
  • HEPA filter replaced if necessary from customers stock
  • Particle counts are taken to ascertain ISO safety standard achieved by cabinet.
  • Airflow velocities are checked
  • Air visualisation
  • Test on alarms if present
  • Checking all work surfaces within cabinet
  • Issue a certificate on all test results
  • Service record kept on database
  • Service card updated and kept on cabinet

All services carried out by skilled, and qualified engineers.


Microbiological Safety Cabinets are extremely important pieces of safety equipment.

Monmouth can provide servicing of many different types of Class I and Class II Biological Safety Cabinets. The servicing involves DOP testing of all accessible filters, KI Discus containment testing and both downflow and inflow testing and recalibration where necessary.

KI-DISCUS Principles of Operation

A fine mist of potassium iodide droplets, produced by a spinning disk, is used as a challenge aerosol to measure the containment of a cabinet or fume cupboard. Centripetal collectors sample the air outside or inside the cabinet – depending on the nature of the test. The collectors deposit any potassium iodide particles that are in the sampled air on to filter membranes. At the end of the sampling period the filter membranes are placed into a solution of palladium chloride whereupon the potassium iodide “develops” to form clearly visible and easily identified grey/brown dots.

A knowledge of the number of droplets in the challenge produced by the mist generator and the number collected in the air samplers enables the protection factor for the cabinet to be calculated. All open-fronted microbiological safety cabinets are assessed on this protection factor. The test method enabled through KI-DISCUS is fully described in British Standard BS5726-1992 and now BS:EN12469:2000.

DOP Filter Testing

HEPA filters are installed in many environments and process applications, but the method for testing them is well recognised and followed across the world.

An aerosol generator is used to produce an oil aerosol that is introduced into the airstream that is going to pass through the HEPA filter to be tested, and an aerosol photometer is used to measure the amount of aerosol upstream and downstream of the filter. The result gives the performance of the HEPA filter reported and identifies if any leaks are present in the frame, seals or media.

Monmouth Scientific | Biological Safety | VHP Sterilisation and Decontamination

VHP Decontamination

Our trained engineers can administer VHP fumigation for effective decontamination of microbiological safety cabinets.

The VHP sterilisation process uses hydrogen peroxide vapour as a anti-microbial, evenly distributing VHP throughout the unit’s enclosure to providing efficacy against viruses, bacteria, yeasts, and bacterial spores, ensuring no potentially damaging condensation or toxic residue remain on surfaces.

The low temperature hydrogen peroxide dry vapour destroys a wide range of microorganisms including bacterial spores, viruses and fungi. The VHP technique does not condense on surfaces, making it an ideal choice for sensitive materials including electronic equipment, HEPA filters, and painted surfaces.

Monmouth Scientific | Service & Maintenance | Cleanroom Certification

Cleanrooms come in all shapes and sizes and fit into various ISO Class Categories according to BS EN ISO 14644. They are also a major investment for a Company and care should be taken when servicing and validating this valuable asset.

Monmouth Scientific generally cover Cleanrooms between ISO Class 6 and ISO Class 9 for servicing and validation purposes.

  • Interior condition checked
  • Exterior condition checked
  • Doors, runners/ hinges checked
  • Lights checked
  • Switches checked
  • Integrity of cleanroom (including seals where applicable)
  • Fans and Clean Air Module conditions
  • Prefilters replaced if necessary from customers’ stock
  • Main filters replaced if necessary from customers’ stock
  • Air room changes per hour recorded
  • Pressure differential between rooms is checked and recorded
  • Particle counts taken and ISO standard achieved by cleanroom recorded.
  • Airflows of each Clean Air Module are checked
  • Testing of low airflow alarms if present
  • Issue a certificate on all test results
  • Service record kept on database
  • Service card updated and kept on cabinet.
    Written record of Cleanroom Report produced and sent after visit.

All services carried out by skilled, and qualified engineers.

Monmouth Scientific | Product | HEPA Filter

Activated Carbon Filters

Monmouth Scientific are able to supply a variety of Carbon Filters that are suitable for almost every application. Please see below for the most common Carbon Filters and their intended application. For multiple applications, we can blend up to four carbon filters together in a special filter – Type MCH. Other applications can be accommodated. Please contact us for more information.

Where extra safety is required, an optional outlet filter can be specified. This should be of the same type as the main filter with the exception of the outlet HEPA filter, which can be specified for particulate removal with ANY of the carbon filter types.

HEPA/UPLA Filters & EU4 Pre Filters

High-quality EU4 pre-filter remove all gross particulate, before being pushed through an ULPA or HEPA filter removing 99.9998% of all particles >0.12 μm in size. This in turn expels the air in a laminar flow and guarantees an ISO Class 4, particle free working environment, providing the best product protection.