Hertfordshire · TR19 inspections and grease testing
TR19 inspections and grease testing in Dagnall, Hertfordshire
One call covers TR19 inspections, grease thickness testing, pre-clean surveys and post-clean verification in Dagnall: survey, fixed quote, work and sign-off. Fully insured, with CHAS, SafeContractor and ISO 9001.
- Post-clean verification after another contractor’s clean
- Sections of duct that cannot be reached
- Pre-clean surveys before a first TR19 clean
Part by part
Horizontal duct runs
Bends and long runs can hold heavy deposits, out of sight of the kitchen.
Restaurants, pubs and hotels
Inspections are done when the kitchen is closed or quiet so the kitchen keeps cooking.
How we handle TR19 inspection in Dagnall
A grease test measures how thick the grease is inside a kitchen extract system. Readings are taken at set points using the Wet Film Thickness Test (WFTT) or the Deposit Thickness Test (DTT). The results show whether the system needs cleaning and how soon. The work covers insurer audits, access surveys and post-clean checks, and people most often call us about missing TR19 certificates or history and insurance renewals needing proof of TR19 cleaning.
In a small place like Dagnall, kitchens are often in older or extended buildings, with long single-storey duct runs, where grease settles in the flat sections. We agree access and timings in advance.
Good records are part of the job. Each visit is written up with photos, covering the work done, any areas we couldn’t access and a recommended next date. Keep it with your fire safety records so it’s ready for an insurer, fire officer or EHO.
- Place
- Dagnall (HP4)
- Region
- Hertfordshire
- Paperwork
- Certificate plus before-and-after pictures
- Quote
- A fixed price before any work starts
- When we work
- Out of hours as standard, 24/7 emergency line
- Telephone
- 0345 646 2711
- Updated
- 30 October 2026
Looking after it afterwards
Here’s the after-treatment advice, in brief:
- Don’t box in or cover duct access panels
- Book the next test on the date in the report
- Mention new equipment or longer hours at the next test
- Flag oily drips near the extract
The report recommends when the system should next be cleaned and tested, based on the readings and how the kitchen is used.
Clean, correctly fitted filters stop more grease reaching the duct. Gaps around filters let grease get past them.
Common problems we fix in Dagnall
You can’t judge grease thickness by eye. A system can look clean at the filters and be heavily coated further in, which is why readings matter.
Most sites get in touch when they notice one of these:
- Sites with gaps in their extract records
- Cleaning intervals that may not suit the kitchen
- Heavy grease suspected in the plenum or ducts
- Systems cleaned on a calendar with no measurements
For schools such as Dagnall VA Church of England School, kitchen extract cleaning is usually booked for the holidays, when the canteen is closed.
Comparing quotes
- Whether the whole system is included, or only the parts that are easy to reach
- Proof of insurance
- Whether they recommend a next date
- What records you’ll receive afterwards
Leave it or put it right?
An EHO visit, an insurance renewal or a fire risk assessment is a bad time to find your extract records are thin. An inspection now gives a site in Dagnall a current picture. Our emergency line runs 24/7, but a planned visit to Dagnall is calmer for everyone.
Kitchens, offices, schools and hospitals are all priced the same way: the size of the job, access, condition and working hours. Call for a fixed quote and we will go through it with you.
Why Dagnall businesses choose us
- Member of BESCA Vent Hygiene Elite, cleaning to BESA TR19® Grease
- In business since 2009
- We diagnose before we treat
- Photo reports with every job
Take a look at what affects the cost or our accreditations and certificates.
FAQs for Dagnall
Can you get to a site in Dagnall?
Yes, Dagnall is part of our area, however small the site. Let us know about access, parking and anything unusual about getting there when you book.
Which fire authority looks after Dagnall?
Hertfordshire Fire and Rescue Service is the fire and rescue service for Dagnall. TR19® is not law, but it’s the benchmark many fire officers and insurers look to when they ask how often the extract is cleaned.
What grease levels does TR19 allow?
Under TR19® Grease, the mean thickness should not exceed 200 microns between cleans. Any reading of 500 microns or more needs immediate spot cleaning.
Do you offer emergency callouts?
Yes, day and night, every day of the year. Our office is open from 8am to 6pm on weekdays, and the emergency line covers the rest.
What types of premises do you cover?
Any site with a kitchen or a ventilation system to look after, from a single café to a large school. We work with hotels, schools, care homes, offices, retail and leisure sites.
What is TR19?
BESA’s ventilation hygiene specification in two main parts: TR19® Grease for kitchen extract systems and TR19® Air for general ventilation. It is not legislation, but it’s the standard people check against.
What is a WFTT or DTT grease test?
Readings are taken using the Wet Film Thickness Test or the Deposit Thickness Test, then compare them with the TR19® Grease figures.
Do you work out of hours?
Yes, and it’s often the best time. The visit is timed for when the area isn’t in use, whether that’s late evening, overnight or a weekend.
The process
We work around your opening hours, not the other way round. Most visits are booked for when the area is out of use, such as evenings, overnight, early mornings or weekends. Once we’re in, the area is sheeted and anything that has to be off is turned off and cooled, and the work takes anything from an hour for a small canopy and short duct to a good part of a day for a large site. Rural roads and tight entrances are worth telling us about before a visit to Dagnall.
- First we look at the system’s cleaning history, if there is one.
- We follow the extract from canopy to discharge.
- We note where access panels are and where more are needed.
- Grease readings are taken and photos recorded.
- You get a report and a fixed quote for the clean.
Preparing for the visit
- Let us know when the site is closed or quiet
- Name a contact who can let us in at the agreed time
- Dig out any earlier paperwork for the system
Getting a quote
Photos are the quickest way to a quote: the system from a couple of angles, plus any access panels or hatches. Add the site type and your opening hours, and we can price many jobs without a visit.
Related advice
What TR19 inspection cannot fix
It’s worth knowing the limits before booking:
- A faulty or failing extract fan
- Sections with no access, until panels are fitted
- Removing the grease, which is a separate clean
Not sure which it is? You can give us a ring on 0345 646 2711, or send details by email and we will tell you honestly before you book.
Parts of the system we cover
- Access surveys
- Insurer audits
- Pre-clean surveys
- Wet film thickness tests
- Deposit thickness tests
- Post-clean checks
What your team can do, and what needs us
Day-to-day cleaning is something your team can do: wiping canopies, washing grease filters and recording it in a log. Inside the ducts, risers and fan is specialist work, which is where we come in.
When your team notices a problem between visits, such as dripping grease, a noisy fan, a smell or a filter that won’t come clean, they should report it rather than try to fix it. We will take a look and send you a fixed quote.
What TR19 inspection looks like in Dagnall
The FSA’s data shows about 3 pubs, bars and clubs registered in and around Dagnall, up to about a mile and a half out. Any of them serving cooked food has an extract to keep clean, from canopy to discharge. The fire and rescue service for Dagnall is Hertfordshire Fire and Rescue Service. In most workplaces, including commercial kitchens, it’s the fire and rescue authority that enforces the Fire Safety Order. In Dagnall, food businesses are inspected by environmental health officers from Buckinghamshire council. They look at how clean the premises and equipment are, and the kitchen extract is part of that. A TR19® certificate and photo report after each clean gives you a record to show an inspector.
Healthcare kitchens, like those at hospitals such as Luton and Dunstable Hospital (about 5.3 miles north-east), often cook for long hours, which puts them in BESA’s heavier-use bands. If you run a church or community hall kitchen, near Church of All Saints or elsewhere in Dagnall, its extract still collects grease from every lunch and event.
Dagnall is in Hertfordshire. We carry out TR19 inspection for businesses, landlords and public buildings in Dagnall and the rest of Hertfordshire. Dagnall is one of 381 places in Hertfordshire we cover for commercial clients. For sites nearby, see our Milton Keynes page, about 16 miles away.
Here we cover the HP4 postcode area for TR19 inspection. We cover sites on Deans Meadow, Dunstable Road and Nelson Road and nearby roads. You will find Dagnall on the B440, which makes it straightforward for our technicians to reach for out-of-hours visits. Neighbouring places we cover for TR19 inspection include Ringshall (2 miles south), Little Gaddesden (2 miles south) and Hudnall (2 miles south). Larger places within reach include Watford (14 miles south-east), Hemel Hempstead (7 miles south-east), St Albans (12 miles south-east), Harpenden (9 miles east), Hitchin (15 miles north-east) and Hatfield (15 miles east).
Landmarks near Dagnall
The nearest railway station is Tring station, roughly 3.7 miles south-west of the centre. Well-known places in the area include Pitstone Green Museum (3.5 miles west) and Luton and Dunstable Hospital (5.3 miles north-east). Green spaces nearby include Ivinghoe Beacon and Sallowsprings.