Cost & commercial
A certified clean looks, from the outside, like someone removing grease. In fact you are paying for a stack of work - a survey, safe access, a full-system clean, verification testing and a registered certificate - each of which is part of why it holds up.
The short answer
It is easy to picture a duct clean as one thing - grease coming off metal - and to feel a certified clean is dear for what looks like a cleaning job. Look closer and the price makes sense: a certified clean is a survey, safe access provision, a full-system clean, verification testing and a registered certificate, bundled into one visit. Each element is real work, and each is part of why the result stands up when it is examined. This page opens the box.
Before and during the clean
The work starts before any grease is touched. A survey inspects the system, measures the deposits in microns and establishes what is reachable, so the clean has a plan and a baseline rather than a guess. Then comes access - opening the system safely, and where there are too few panels, making provision so the ductwork can actually be reached. On taller or concealed systems this means working at height with the right equipment. None of it is glamorous, but without it the clean either cannot happen properly or cannot be proven.
The clean itself is the part most people picture, and it is substantial: the whole system from canopy through the horizontal and vertical ductwork to the fan and discharge point, brought to the required cleanliness with scraping, brushing, degreasing and mechanical tooling. A compliant clean does not stop at the canopy and filters - the ductwork is where grease is most dangerous, and it is included.
After the clean
The back half of the stack is what separates a certified clean from a tidy-up. The result is verified - surfaces confirmed below fifty microns using deposit testing - by a qualified technician, not just eyeballed. That feeds a report with before-and-after photographs from matched positions, the deposit readings and notes on scope and access. Finally the clean is lodged on the register via the verification portal, and a certificate is issued that an insurer, an environmental health officer or a fire officer can check independently.
That closing work is quiet but it is the point. It is the difference between a system that is clean and a system you can prove is clean - and provability is what the certificate exists to give you. It is also work: qualified time, testing, documentation and registration, all folded into the price.
Why the bundle is the value
Strip any element out and the certificate weakens. Skip the survey and there is no baseline to verify against. Skip proper access and the concealed runs go uncleaned. Skip verification and the report cannot prove the result. Skip registration and the certificate cannot be checked. What you are paying for in a certified clean is the whole chain intact - because a certificate is only worth what the work behind it can support, and the work behind a real one is exactly this stack.
Questions
A survey, safe access provision, a full-system clean from canopy to discharge, verification testing by a qualified technician, a report with before-and-after photos and readings, and a registered certificate. Each is real work behind the price.
The grease removal is one part. Around it sit the survey and baseline, the access work, the verification that confirms surfaces below fifty microns, the documentation and the register entry - which together make the result provable, not just done.
Because the ductwork beyond the canopy is where grease is most dangerous and where fire spreads. A clean that stops at the canopy and filters is not compliant, however tidy it looks.
It confirms the surfaces are below fifty microns using deposit testing, carried out and signed off by a qualified technician. That evidence, with photos and readings, is what turns a clean into a certificate that holds up.
Lodging the clean on the register via the verification portal lets an insurer, environmental health officer or fire officer check the certificate independently. Without it the certificate is just an unverifiable claim.
Phoenix Duct Clean · by the numbers
We survey, clean the full system, verify it below the standard and register the certificate - and we show you each step, so you can see exactly what your money bought.