Ruislip · COSHH / HSG258
Statutory thorough examination and testing of local exhaust ventilation for Ruislip workshops and production sites, keeping fume and dust control compliant with COSHH and HSE guidance HSG258.
Ruislip
Ruislip sits at the north-western edge of London in the Borough of Hillingdon, a place that was still a farming village in rural Middlesex until the Metropolitan Railway reached it in 1904 and turned it into one of the model suburbs of Metro-land. It keeps a remarkable amount of its past - the Great Barn at Manor Farm is the oldest timber-framed barn in Greater London, raised between 1280 and 1300 from oaks felled in Ruislip Woods.
Its modern working economy runs on light engineering, the building trades and food, much of it in the trade units off Victoria Road and Stonefield Way in South Ruislip and at Odyssey Business Park opposite RAF Northolt.
Wherever a Ruislip process releases fume, dust, mist or vapour, COSHH puts the duty on you to control it at source, and the extraction that does so is LEV - subject to a thorough examination and test at least every fourteen months. We work across the range, from the Stonefield Way units down to the smallest Ruislip workshop, measuring capture and face velocity and issuing a plain pass-or-remedial result with every hood tagged.
By sector
Where fume, dust, mist or vapour is pulled away at the point it is made, that is LEV - and for employers in Ruislip and across Greater London it stands as their COSHH evidence.
Oil-mist and coolant-mist extraction on CNC lathes and machining centres across the South Ruislip trade units, and on the component and maintenance work that has clustered around RAF Northolt since its Battle of Britain days.
Steam canopies and flour-dust control in the bakeries and food units of the borough, on ground that once carried the Old Dairy on Victoria Road before its redevelopment.
Fine-dust extraction and downdraught tables at Ruislip cabinet and joinery shops, where hardwood and MDF dust is captured at the tool before it reaches the lungs.
On-torch extraction, fume arms and downdraught benches across the Stonefield Way and Odyssey Business Park units. Since the HSE's 2019 reclassification, all welding fume - mild steel included - is treated as carcinogenic.
Spray-booth and prep-bay extraction at the South Ruislip bodyshops and garages, some running since the 1980s. Two-pack paints release isocyanates - the leading cause of occupational asthma - so booth airflow is examined to its design figure.
Fume-cupboard face-velocity testing for the borough school and college science labs and the broadcast and technical facilities at Odyssey Business Park, to the containment their work demands.
On the ground in Ruislip
We are out under Ruislip's extraction every week. The proof that matters is the jobs, not a stock photo.
An upholstery workshop in Ruislip had capture velocity at several of its extraction hoods reading below benchmark, down to debris built up in the ducting. We carried out a full thorough examination and test, taking velocity readings, running smoke visualisation and checking the filter. Once cleared, the LEV passed on re-test across the saw and sander hoods, and we issued a signed HSG258 report. The work was timed for the Christmas shutdown while the workshop was quiet.
The test
A statutory LEV test under HSG258 is not a visual once-over. On a Ruislip system it answers three things: is the system intact, does it still capture, and does that capture match what it was designed to do.
Ductwork, hoods, filters, fans and dampers checked for damage, blockage and leakage across the Stonefield Way units - the faults that quietly kill capture.
Face and capture velocities, static pressures and airflows measured at each hood with calibrated instruments - numbers, not opinion.
Readings compared to the system's commissioning figures, so drift from as-designed is caught before it becomes a failure on a Ruislip line.
Where exposure is in question - a precision engineering and manufacturing process, say - sampling confirms whether control is actually protecting the people at the process.
The duty
COSHH Regulation 9 puts a hard duty on the employer: any LEV controlling a hazardous substance must have a thorough examination and test at least every fourteen months, with records kept for five years.
For the great majority of Ruislip sites, from the Stonefield Way units to the one-man workshops, the fourteen-month deadline is what catches people out: once it passes the system is non-compliant regardless of its actual state. We carry out the examination, label every hood with its status and next-due date, and issue the report an HSE inspector or your insurer expects to see - and if a point fails, you get the number, the cause and the fix rather than a bare fail.
How it runs
Full visual and structural check of every hood, duct run, filter and fan across the Ruislip site.
Calibrated velocity, pressure and airflow readings at each extraction point.
A COSHH-compliant report: results against benchmark, clear pass or fail, and plain-English actions for the Ruislip duty-holder.
Each system tagged with status and next-due date, so compliance is visible on the Odyssey Business Park floor.
Questions
Under COSHH Regulation 9, most local exhaust ventilation needs a thorough examination and test at least every 14 months, with higher-risk processes more often. A precision engineering and manufacturing bay, a food and drink production bench and a lab fume cupboard can each sit on a different interval - we set the right one for every system.
precision engineering, food and drink production, woodworking and joinery, welding and fabrication, vehicle body and paint, and laboratory fume cupboards - the trades clustered around Stonefield Way and Odyssey Business Park and across the wider Greater London.
Yes. Each hood is labelled with its status and next-due date, and you get the HSG258 report and system schematic for your COSHH file - the record an HSE inspector visiting a Stonefield Way unit will ask to see.
Yes. A new spray booth or fume-arm install at a Ruislip workshop needs a commissioning test to prove it performs to its design figures before it goes into service - we measure it and document the baseline the 14-month clock then runs from.
Yes - the industrial estates and workshops around Stonefield Way and Odyssey Business Park, the university and hospital labs, and the wider Greater London.
We record it as remedial and set out what is needed - airflow, ductwork, filtration or capture at the hood. You do the work and we re-test, and on a Stonefield Way production line we can usually fit the re-test around your shifts. We will not pass a system that does not control exposure.
Yes. We plan testing around production shifts at the Stonefield Way units, term-time access at the Ruislip university labs, and normal hours at smaller workshops, so the examination never stops the line.
Local knowledge
RAF Northolt opened in 1915 and flew Hurricanes and Spitfires through the Battle of Britain, later home to seven Polish-manned squadrons remembered by the Polish Air Force Memorial that marks the southern edge of South Ruislip. That aviation-engineering instinct still runs through the machine shops and maintenance units around the airfield, and every one of them carries a duty to control the mist, fume and dust its work throws off. We test and certify local exhaust ventilation to the standard COSHH sets, so the extraction reads true against its design figures.
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