Bushey · COSHH / HSG258
Statutory thorough examination and testing of local exhaust ventilation for Bushey workshops and production sites, keeping fume and dust control compliant with COSHH and HSE guidance HSG258.
Bushey
Bushey is an affluent commuter town on the Hertfordshire edge of Watford, home to around twenty-five thousand people just inside the M25 on the London fringe. Its name carries real weight in art and film history: Sir Hubert von Herkomer opened his celebrated art school here in 1883, and the village became a colony of more than seventy resident artists, while the daylight glass studio he built is said to be the earliest surviving film studio in England.
Its working economy today runs on light manufacturing, the motor trade and food production, much of it in the industrial units off Park Avenue and along the Watford and Elstree fringe, with the neighbouring business sheds at Centennial Park drawing in the heavier trades.
Every one of those Bushey processes puts fume, dust, mist or vapour into the air, and COSHH requires it controlled at source - which means local exhaust ventilation, thoroughly examined and tested at least every fourteen months. We test the LEV across all of it - from the Park Avenue units to the smaller Bushey workshops - with capture and face-velocity readings, a clear pass or remedial outcome and system labelling.
By sector
If a process captures fume, dust, mist or vapour at source, that capture system is LEV - and across Bushey and the wider Hertfordshire it is your evidence under COSHH.
Oil-mist and coolant-mist extraction on CNC machining centres and turning shops in the light-industrial units off Park Avenue and the Bushey Hall Road fringe, where fine metalworking feeds the wider Watford supply base.
Steam canopies and flour-dust control in the bakeries, kitchens and food units that supply the town, from the parades of Sparrows Herne to the production sheds on the Watford and Elstree border.
Fine-dust extraction and downdraught tables at Bushey cabinet shops and joinery works, where hardwood and MDF dust is captured at the tool before it can reach the lungs.
On-torch extraction, fume arms and downdraught benches across the Park Avenue and Centennial 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 Bushey bodyshops and MOT garages, the trade Bushey Hall Garage and the workshops off Bushey Hall Drive have run for decades. 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 local school science departments, including the Purcell School's premises, and for the dental and clinical labs around the town, to the containment their work demands.
On the ground in Bushey
We are out under Bushey's extraction every week. The proof that matters is the jobs, not a stock photo.
The extraction on the fabrication bench at a family-owned welding bay in Bushey wasn't pulling as it should, down to a filter well overdue for replacement. We checked static pressure, cleared an unsealed joint and re-tested each point against benchmark. One point failed on a loose joint at first and passed after remedial work, with a thorough examination and test certificate to follow. We handed the foreman a short photo report for their compliance records.
The test
A statutory LEV test to HSG258 is far more than a look round. On a Bushey system it settles three questions: is the ductwork and plant intact, does it still capture at the hood, and does that capture still match the design.
Ductwork, hoods, filters, fans and dampers checked for damage, blockage and leakage across the Park Avenue 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 Bushey 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
Under Regulation 9 of COSHH the obligation sits squarely with the employer - any LEV that controls a hazardous substance needs a thorough examination and test at least every fourteen months, and the records held for five years.
For most Bushey sites - from the Park Avenue units to the smaller workshops - the fourteen-month clock is the one that bites: miss it and the system is non-compliant the day it lapses, whatever its condition. We examine, label each hood with its status and next-due date, and issue the report an HSE inspector or your insurer will ask to see. If something fails, you get the reading, the cause and the fix - not just a red sticker.
How it runs
Full visual and structural check of every hood, duct run, filter and fan across the Bushey 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 Bushey duty-holder.
Each system tagged with status and next-due date, so compliance is visible on the Centennial 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.
Yes. We plan testing around production shifts at the Park Avenue units, term-time access at the Bushey university labs, and normal hours at smaller workshops, so the examination never stops the line.
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 Park Avenue production line we can usually fit the re-test around your shifts. We will not pass a system that does not control exposure.
A dated report to the HSG258 method, the readings taken, a pass or remedial outcome for each hood, and system labelling - the evidence a duty-holder at Park Avenue or a smaller Bushey workshop needs for their COSHH file.
precision engineering and manufacturing, food and drink production, woodworking and joinery, welding and fabrication, vehicle body and paint, and laboratory fume cupboards - the trades clustered around Park Avenue and Centennial Park and across the wider Hertfordshire.
No. LEV testing is a statutory examination of fume and dust control to COSHH and HSG258, with capture and face-velocity readings; TR19 is kitchen grease and fire risk. We do both across Bushey, but a Park Avenue fabrication shop and a Sparrows Herne canopy are kept as the separate jobs they are.
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 Park Avenue unit will ask to see.
Local knowledge
Bushey has never been a mill town, but its living has long come from the workshops and motor trades strung along the Watford fringe, where garages like Bushey Hall Garage have serviced and sprayed vehicles since the 1950s. Those bodyshops, joinery works and light-engineering units still throw off the same mist, fume and dust their trades always have, and every one of them carries a duty to control it. We test and certify local exhaust ventilation to the standard COSHH sets, so the extraction reads true against its design figures. From the spray booths off Bushey Hall Road to the machine shops at Park Avenue, the airflow is measured, not assumed.
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