Borehamwood · TR19 Grease
We clean the full commercial duct run - grease, dry and laundry ductwork, canopy to roof fan - for kitchens, offices and industrial sites across Borehamwood, and certify it to the TR19 Grease standard your insurer expects.
Borehamwood
Borehamwood rates hundreds of food premises, and behind a large share sits an extract duct a canopy clean never reaches - plus the dry ductwork and air-handling that keep its offices and public buildings running.
The city's kitchens sit in tight, mixed stock - Shenley Road, Theobald Street, Well End - with long concealed duct runs up to roof fans. We clean the full run to the TR19 Grease standard, canopy to fan, including the horizontal and vertical sections a canopy-only clean leaves coated.
Beyond the kitchens, we clean the dry ductwork and air-handling in offices, schools and public buildings, and the lint-heavy laundry ducts in hotels and care homes. High-output kitchens - studio canteens, hotel and pub kitchens, the busy Shenley Road takeaways and the town's cafes and restaurants - lay grease down fast in exactly the concealed sections where a fire travels.
The standard
TR19 Grease is the benchmark Borehamwood insurers and fire risk assessors expect - measured across the whole extract run, not just the visible mouth of the canopy.
Because the standard is written around film thickness, it sets the depth that triggers a clean and re-test. In the mixed roof spaces around Shenley Road and Well End, a canopy-and-filter wipe leaves the duct interior - where grease piles up and a fire runs - completely alone. We reach the whole Borehamwood run through existing hatches and new ones we cut, clean back to bright metal, take before-and-after grease-depth figures at set points, and certify it to TR19 Grease with those depths on the record.
By system
The fire risk. Fried-food extract coats duct walls in combustible grease; cleaned canopy to fan and certified to TR19 Grease.
Supply and general extract in offices and public buildings, carrying dust and debris that throttles airflow and loads the air-handling unit; cleaned to TR19.
The hidden one. Tumble-dryer ducting packs with lint - highly combustible - in Borehamwood hotels, care homes and gyms.
On the ground in Borehamwood
We are in Borehamwood's ductwork and plant every week. The proof is the jobs, not the stock photos.
A privately owned church hall in Borehamwood had fine dust and debris built up through its air supply ducting and across the supply grilles. We cleaned the ducting with air whips under negative pressure and renewed the dirty panel filters. Indoor air quality picked up noticeably across the offices, and the feedback afterwards was excellent. We set up a recurring six-monthly clean to keep on top of it.
When it is due
Ductwork rarely warns you politely. In a busy Borehamwood kitchen these are the tells.
The tells are plain: steam that lingers, odours drifting back over the diners, drips off the canopy onto a Shenley Road line, a rim of grease at the filters, or a Borehamwood insurer or fire assessment wanting a TR19 certificate you cannot show. Frequency tracks the cooking load - a hard-frying Theobald Street kitchen needs it far more often than a quiet cafe - and your certificate sets the date, so nothing is left to chance.
How it runs
Inspect the full Borehamwood run, find the access gaps in the concealed sections, agree scope and frequency.
Fit inspection hatches where the run is sealed - common in the older Well End conversions - and protect the kitchen.
Canopy to roof fan, down to bare metal, with before-and-after grease-depth evidence.
TR19 Grease certificate, grease-depth record and next-due date for your Borehamwood fire logbook.
Why it matters
Three duties push every Borehamwood operator to keep ductwork clean, and they reinforce one another.
Fire safety law. Under the Regulatory Reform (Fire Safety) Order 2005, the responsible person for a Borehamwood premises must assess and manage fire risk. A grease-laden duct is one of the most serious risks in any catering building, because a flare-up on a Shenley Road cookline can travel the ductwork and spread fire through concealed voids. The Health and Safety at Work etc. Act 1974 and the HSE reinforce the same duty of care.
Insurance. Your Borehamwood insurer expects a current TR19 Grease certificate as proof the duct is clean. Without one, a fire claim can be cut back or turned down altogether - a costly thing to find only after a fire.
Hygiene and environmental health. When Hertsmere Borough Council carries out a food hygiene inspection it judges the physical state of the premises, and ventilation is part of that. A grease-choked extract can pull down the rating an Environmental Health Officer gives, on top of the odour and the weakening airflow your staff put up with.
It is set by cooking hours under TR19 Grease - roughly every three months for heavy use of 12 to 16 hours a day, every six for moderate, every twelve for light. A hard-frying Shenley Road kitchen sits in a tighter band than a daytime Theobald Street cafe. We measure the grease load and confirm your interval.
Yes. The fan at the top of a Well End or city-centre riser is where grease throws off the blades and the run ends - we degrease it and its housing, because a loaded fan is what finally stops a system pulling.
The full run, canopy through the concealed horizontal and vertical ductwork to the roof fan - the hidden sections a canopy-only clean leaves loaded, which matters in the tight stock around Shenley Road and Well End where the runs are long and awkward.
A dated TR19 certificate, before-and-after photographs of each section, and an access report for your fire logbook - the evidence a Shenley Road operator's insurer and fire risk assessor expect.
We fit compliant access panels where the ductwork has none, so every internal section can be reached, cleaned, inspected and certified - common in the older Well End conversions where the run was boxed in with no hatches.
Little, if it is planned. We survey the Borehamwood run first, agree a slot overnight or on a close day, sheet off the kitchen and clean section by section, so a Theobald Street cookline is back in service for the next shift.
Yes. We clean the dry ductwork and air-handling in Borehamwood offices, schools and public buildings, and the lint-heavy laundry ducts in the Hertfordshire hotels and care homes, alongside kitchen grease ducts.
Local knowledge
When the Danziger brothers opened their New Elstree Studios in 1955 they did it by converting a wartime aero-engine testing factory near the Aldenham reservoir, running six sound stages out on an assembly line before the site closed and made way for the Waterfront Business Park. Borehamwood is full of that kind of reused industrial fabric, and modern premises hide their air inside sealed ductwork where grease, dust and debris build unseen until airflow fails or fire finds a path. We clean and inspect ventilation and extract ductwork across the town, then hand over photographic before-and-after evidence of every run.
Phoenix Duct Clean · by the numbers
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