Hertfordshire · TR19 inspections and grease testing
TR19 inspections in Throcking
TR19 inspection across Throcking and nearby, timed so the site keeps working and signed off in writing with photos.
- Insurers asking for TR19 evidence
- Heavy grease suspected in the plenum or ducts
- Systems that need surveying before cleaning
What affects the quote in Throcking
We quote each job individually. These are the things that affect it:
- Site rules, permits and inductions
- Whether several sites go on one quote
- What state the system is in
- Working hours and out-of-hours timing
What you pay depends on the size of the system, what state it’s in and how easy it is to reach. We give you a fixed price before work begins, so you know where you stand.
What we need to know
The more you tell us, the more accurate the quote. With your enquiry, please include:
- The postcode and the type of business
- Your opening hours and when the area is out of use
- Your last certificate, test record or report
- The roof, plant room or outside wall the system runs to
To help us quote: where the site is, what it is and its opening hours, a few pictures and any previous report or certificate. Once you have those, ring 0345 646 2711 or email us.
TR19 inspection in Throcking
Under TR19® Grease, the mean grease thickness should stay at or below 200 microns between cleans, while a reading of 500 microns or more anywhere calls for immediate spot cleaning. Grease testing shows which side of those lines you are on. The work covers post-clean checks, pre-clean surveys and insurer audits, and people most often call us about pre-clean surveys before a first TR19 clean and checking the result of a recent clean.
Work in a small place like Throcking starts with a call to agree access and timings, and the clean covers the whole system, as it would anywhere: canopy to discharge, then a TR19® certificate and a photo report.
The sign-off is always in writing: a written report, dated and illustrated with pictures, plus a certificate through the BESCA Vent Hygiene Elite portal when the work is a TR19® Grease clean. It shows what was done and what, if anything, couldn’t be reached.
- Location
- Throcking (SG9)
- Region
- Hertfordshire
- Reporting
- Certificate and photo report
- Price
- Fixed quote, typically within a working day
- Working hours
- After hours by arrangement; emergencies any time
- Telephone
- 0345 646 2711
- Last updated
- 30 October 2026
Leave it or put it right?
If a kitchen in Throcking has been cleaned on the same calendar for years, there’s no way to know if that interval is right without measuring. Testing gives you the evidence to set it properly. Our emergency line runs 24/7, but a planned visit to Throcking is calmer for everyone.
One small site or a whole estate, the quote is built the same way: what needs doing, how we get to it and when. You’ll have a fixed price before work begins.
Why choose Duct Doctor in Throcking
- CHAS, SafeContractor and ISO 9001
- Fixed quotes from a survey or photos
- Member of BESCA Vent Hygiene Elite, cleaning to BESA TR19® Grease
- Trading since 2009
When to call us in Throcking
Not every section of a kitchen extract is easy to get to, and grease can be missed there clean after clean. An inspection of a system in Throcking shows where access panels are missing, so the gaps can be closed.
If you notice any of these, it’s worth a diagnosis:
- Missing access panels found on survey
- Systems that need surveying before cleaning
- Heavy grease suspected in the plenum or ducts
- Checking the result of a recent clean
Volunteers running a hall kitchen near Holy Trinity Church, or anywhere in Throcking, may not know when the extract was last cleaned, and a grease test settles it.
What to look for in a quote
- Whether inaccessible sections are listed on the report
- What hours they’ll be on site
- Which accreditations they hold, and whether you can check them
- Whether the figure could change on the day
Questions from Throcking
Can you clean school kitchen extracts in Throcking during the holidays?
Yes, out-of-term visits are normal for schools. Around Throcking, the Food Standards Agency lists about 2 schools and colleges with registered kitchens within a mile and a half or so. Just call us on 0345 646 2711 or email us with your term dates and we will plan around them.
Which fire and rescue service is responsible for Throcking?
It’s Hertfordshire Fire and Rescue Service, which covers Throcking. It’s worth keeping your fire risk assessment, TR19® certificates and photo reports together, ready to show.
What does a pre-clean survey involve?
The survey covers the whole system, grease readings and access to each section. It lets us plan the clean and give you a fixed quote.
What information do you need?
Some pictures and a quick description of the system plus the address and your hours. If we need more, we will ask.
What is a WFTT or DTT grease test?
The Wet Film Thickness Test (WFTT) and Deposit Thickness Test (DTT) measure how thick the grease is at a given point. We take readings at set points from canopy to fan.
How do you keep the site clean during the work?
We start with protection: sheeting over floors, worktops and anything close to the work. The area is left tidy, with our waste taken away.
Will you produce a report for our insurer?
Yes. Our TR19 audits cover readings, photos, access and a recommended cleaning interval. You can pass it straight to your insurer or broker.
Do you cover Throcking?
Yes. We cover Throcking and across Hertfordshire, within our South East and London area. To book, call 0345 646 2711, or send details by email.
For landlords and multi-site operators
Running several sites is easier with one contractor. We cover South East England and London, so visits at different addresses can be planned together and kept to a regular schedule.
The Fire Safety Order 2005 puts the duty to manage fire risk on the responsible person, which may be the employer, owner, landlord, FM or managing agent. Where responsibility is shared, records matter even more.
Grease, kitchens and Throcking
At about 31 miles from central London, Throcking sits well inside the area we cover. We work evenings, overnight and at weekends, so the visit fits around the site. In Throcking, food businesses are inspected by environmental health officers from East Hertfordshire council. Extraction counts as kitchen equipment, so its condition can come up on the day. A TR19® certificate and photo report after each clean gives you a record to show an inspector.
If you look after a school kitchen, at a school such as Freman College or anywhere near Throcking, the holidays are the usual time for a TR19® clean.
Throcking is about 6 miles north-east of Stevenage, in Hertfordshire. We carry out TR19 inspection for commercial premises of every kind in Throcking and the rest of Hertfordshire. Our Hertfordshire coverage runs to 381 places, Throcking among them. Chelmsford is in our area too, about 28 miles from Throcking.
We cover every part of SG9 for TR19 inspection and the streets around it. We also cover Cottered (1 mile south-west), Chipping (1 mile north-east), Buntingford (2 miles east), Aspenden (2 miles south-east) and Layston (2 miles east). Further out, we also cover Stevenage (6 miles south-west), Bishop's Stortford (11 miles south-east), Welwyn Garden City (12 miles south-west), Hitchin (9 miles west), Hoddesdon (14 miles south) and Hatfield (15 miles south-west).
Near you in Throcking
Other landmarks nearby include Clothall Castle (4.1 miles west). The countryside around Throcking includes Hawkins Wood.
Different parts, different methods
Horizontal duct runs
Sections without access are recorded so it can be fixed before the clean.
Schools, hospitals and care homes
Education kitchens need TR19 inspections like any other. Readings show if the interval is right.
In-house cleaning or a specialist?
Some jobs should never be done in-house: opening up ductwork, cleaning fans, drop testing fire dampers and measuring grease need training, the right equipment and safe access. Leave those to us.
Your own staff can handle the daily basics: wiping down canopy surfaces, cleaning filters and keeping a simple log. What they can’t safely do is clean inside the ductwork, the fan or the risers, and that’s where we come in.
Also in Throcking
What happens on the day
When we arrive, we check the system against the survey or the pictures you sent. Anything unexpected is raised with you before we go further. After that, the work takes an hour or two for a single kitchen, longer for a large or complex system. Photos of the system and how to reach it help us plan a visit to Throcking.
- After the clean, we arrange a time to check the system.
- We open the access points used on the clean.
- Grease readings are taken again at set points.
- Photos are taken to show the condition after the clean.
- We report the findings and flag any areas that need more work.
Getting ready for the visit
- Have your last certificate or report to hand
- Make sure someone can let us in and lock up afterwards
- Let us know how we reach the system, including roofs, risers and plant rooms
Getting a quote
Quotes are quick. Send a few details and photos, and we typically reply with a fixed quote within one working day. Where a survey is needed, we arrange a time that suits the site.