Our Services

At Scarr L.E.V Services we believe that you should get the very best service at an affordable price, but this does not mean that corners are cut. To achieve this we follow the recommendations and guidance as given in the Health and Safety Executive (HSE) document HSG258 “Controlling Airborne Contaminates at Work” to ensure that the LEV test is carried out to the highest standard. In addition to this we also draw on additional information given by the HSE and other governing bodies such as, for example, British Standards, to ensure that your system, process and employees get the best relevant advice and Thorough Examination & Test (TExT).

Thorough Examination of L.E.V system

Every system gets a thorough examination which is tailored to the system and may involve the following visual inspection as a minimum

Ductwork, ductwork fittings and fixtures
  • Visual checks to ensure that there is no damage to any ductwork or any of its fittings
  • Visual checks to the fixing of the ductwork (wall brackets, Ceiling cables, etc.)
  • Internal visual checks for blockages and contaminate build-up
Motors and Fans (Fan set)
  • Visual checks to the structural integrity of the fan set
  • Visual examination of any fan belts in use
  • Visual examination of any fixtures and fittings related to the fan set
Electrical Inspection
  • All wiring inspected for any damage
  • Cable glands inspected to ensure that cables are held securely
  • Any electrical item inspected to ensure that it is fitted correctly and securely
  • Inspections for visual condition of filter media
  • Filter seals are inspected for any damage or signs of leakage
Hoods, Cowls, Arms and Enclosures
  • Inspected for damage
  • Inspected for correct usage

L.E.V System Testing

Every system undergoes a series of tests to ensure that the performance of the system provides adequate protection to the employee that is using it and at the same time these tests highlight any potential problems that may cause the system to stop working correctly so that you can take the necessary steps to prevent system failure. These tests again are tailored to the system and the process but generally include the following as a minimum.

Ductwork tested for static pressure, air speed and air volume
  • This is done to ensure that the duct work remains clear of any blockages as too low an airspeed and any process contaminates may settle and cause blockages, changes in static pressure from test to test may indicate problems and blockages that require further investigation.
Filter Pressure Drop
  • The static pressure on both the clean and the dirty side of the filter are recorded where it is possible to take such readings, the resulting difference in pressures gives an indication to the condition of some filter media types.
Face velocities, capture distances, quantitive and qualitative testing
  • This is probably the most important area of testing as it indicates whether or not the operator is protected, as too low a face velocity or too short a capture distance and the contaminate won’t be removed from the process and may enter the operator’s breathing zone.

Fume Cupboard Testing

Fume cupboard testing follows the same basic methods as L.E.V testing but with a few noticeable differences

Duct Velocities
  • Fume cupboards don’t generally remove much in the way of solid particulate and therefore can use lower duct velocities as indicated in the British Standards
  • External exhaust stacks also need their exit velocity measuring to ensure that the extracted fume is unable to return back into the building
BS EN 14175 Type Tested Ducted Fume Cupboards
  • Type tested BS EN 14175 Fume cupboards have their own set of guidance notes and recommendations and therefore should be tested accordingly, these generally centre around the installation as a whole and include basic checks to other services such as gas, water, light levels and noise requirements.
  • Some basic environmental checks are also required such as barometric pressure, room temperature, make up air, room airflows and furniture locations which may affect performance
BS7989 Type Tested Recirculatory Fume Cupboards
  • Recirculatory fume cupboards that are type tested to BS7989 are tested the same as BS EN14175 fume cupboards for their performance but may have to undergo additional testing to ensure that the filters are performing correctly
  • A BS7989 fume cupboard with HEPA or ULPA filters depending on usage may also require additional DOP filter testing to ensure that there are no holes in the filters or the filter seals – an extra charge is made for this testing due to the additional time and costs involved
Microbiological Safety Cabinets (MBSC)
  • There are different test methods applied to this type of fume cupboard due to the way that it cleans and moves the air around as a normal face velocity test gives false readings.
  • The HEPA and ULPA filters fitted are an integral part of the operation of this type of equipment and therefore in most cases DOP filter testing is essential – an extra charge is made for this testing due to the additional time and costs involved
  • If the Microbiological Safety Cabinet (MBSC) is used to protect the user from a biological agent then robustness of containment testing using KI-Discus testing is a legal requirement in the UK – unfortunately we are unable to provide this service at this time.
Fume Cupboards in Schools and Colleges
  • Most schools and colleges stipulate that their fume cupboards must be tested to the standard given in the CLEAPSS document G9 – not a problem our testing takes this into consideration  and all the relevant tests and documentation are provided to cover this  – please request this if required prior to quoting and placing your order


This is an important area of the process and is often overlooked. The L.E.V test report must contain a certain level of detail, with- out this there is insufficient information as to what the system does, what the contaminates are, who is protected and whether or not it actually works and provides adequate protection. This documentation not only provides you with valuable information about the L.E.V system, but it is also a legal requirement for your COSHH files and may come under scrutiny by the HSE, your insurance company and should the worst happen, an employee becomes ill, it shows that you have done everything within your power to ensure that you have done your legal duty to protect your employees from harm. This documentation forms part of your COSHH file and must be kept for a minimum of 5 years.

We like to think that our documentation is of the highest standard and goes above and beyond the minimum requirements to give you a full and clear understanding of the L.E.V System, and therefore includes the following as a minimum.

Site risk assessment

Sent before the site visit to identify any hazards that the engineer might come across

Method Statement

Sent before the site visit so that you are fully aware of what the engineer is going to do

Report overview and schedule

This gives you an understanding of the testing carried out, the systems tested, whether or not the system has passed or failed and if there is any remedial work required

The L.E.V report

This contains all of the relevant information about each individual L.E.V system, this report is bespoke to the system and will contain the following as a minimum

  • Location of the system
  • Description of the system and how it works
  • Identification of the process and its contaminates
  • A comprehensive drawing of the system detailing key parts and test point locations
  • System photographs
  • System identification – make, model, serial no’s, etc.
  • Details of visual inspections made and notes on observations
  • Details of physical testing and calculations derived from the test results
  • Results from qualitative testing
  • Remedial works and required repairs
  • Conclusion of the inspections and testing
  • Comparisons with previous tests and commissioning data (if available)
  • Declaration of conformance.
  • All test points individually labelled at the time of test
log book

A basic log book provides a simple way of documenting all of the necessary routine daily, weekly and monthly checks that should be carried out by yourselves so as to provide an on-going picture as to the system’s health and your employees’ understanding of the system.

***NEW FOR 2018*** P.A.T Testing

Portable Appliance Testing (P.A.T Testing), as an employer you have a duty of care to ensure that your employees or, in the case of public places, members of the public are protected from electric shock caused by faulty electrical equipment

  • Testing carried out to any piece of electrical equipment covered within the scope of IET 4th Edition Code of Practice for In-service Inspection and Testing of Electrical Equipment
  • Currently only available in the following areas – Yorkshire, Derbyshire, Nottinghamshire and Lincolnshire, other areas considered depending on the quantity of items requiring testing.
  • Available Nationwide if combined with L.E.V Testing

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