Cost & commercial
A certified clean is a defined piece of work, not a vague tidy. It cleans every component of the extract system, verifies the result with readings, and hands back a documented certificate - which is precisely what separates a compliant clean from a cosmetic one.
The short answer
A certified clean is a defined piece of work, not a vague tidy. It cleans every component of the extract system, verifies the result with readings, and hands back a documented certificate - which is precisely what separates a compliant clean from a cosmetic one.
The detail
It starts with an inspection that records the baseline - the condition of the canopy, filters, duct and fan, with photographs and, where needed, a borescope look inside the duct. This sets what needs doing and gives the before half of the before-and-after evidence.
Then the full path is cleaned. The canopy interior and exterior are degreased, including light fittings and drain channels; the baffle filters are cleaned or flagged for replacement; the plenum, the horizontal duct, the riser and the fan are cleaned through access panels using rotary brushes, scrapers and approved agents back to TR19 Grease condition.
The fan is cleaned and inspected, not just wiped - belts, bearings and electrical connections are checked, because a grease-fouled impeller runs out of balance and wears fast. Any fire-rated ductwork and access panels are checked and closed correctly, so the system is returned sealed and working, not just cleaner.
Finally the result is verified. Deposits are measured at set points, aiming below 50 microns, with the mean grease held to around 200 microns between cleans. Verification is what makes the certificate mean something - it records a measured outcome rather than an opinion that the system looks clean. The reading is the fact and the shine is only the impression, which is why a certificate leans on the figure rather than the look.
What it means for you
The certificate is the headline, but the report behind it is what defends you. It should carry before and after photographs from matched positions, micron readings at the stipulated locations, a schematic or list of the system and areas cleaned, a works summary, and a clear note of any areas that could not be accessed. That last point matters, because an honest report says where it could not reach as clearly as where it did, so nothing is quietly assumed clean.
That documentation is what insurers, fire risk assessors and environmental health officers recognise. A certificate registered with the appropriate scheme, from a competent contractor, is evidence of due diligence; a bare invoice with no readings or photographs is not, however clean the kitchen looks.
Phoenix Duct Clean cleans the full system and hands back the complete record - certificate, photographs, readings and notes - so what you pay for is provable compliance you can put in front of anyone who asks.
The service behind the guide
Sibling guides
how filters and fan access move a quote · one-off vs scheduled costs · the certificate that proves compliance
Questions
An inspection and baseline, cleaning of the full system - canopy, filters, plenum, duct, riser and fan - verification with micron readings, and a documented TR19 Grease certificate with before and after photographs. It is the whole path, not just the hood.
A certificate plus a report with matched before and after photographs, micron readings at set points, a system schematic or component list, a works summary, and a note of any inaccessible areas. Keep it for insurers and inspections.
Yes. The fan is cleaned and inspected - belts, bearings and connections checked - because a grease-loaded impeller runs out of balance and fails early. A clean that skips the fan is not a full-system clean.
Deposits verified below 50 microns after cleaning, with the mean grease held around 200 microns between cleans. A single reading of 500 microns or more calls for immediate localised cleaning.
Because it is what proves due diligence to insurers, fire risk assessors and environmental health. Without photographs and readings, there is no evidence the system was cleaned to standard - just a cleaner-looking kitchen.
Phoenix Duct Clean · by the numbers
Book a certified extraction clean and get the full report - photographs, readings and certificate.