Survey, access, clean, certify how a duct clean actually runs

Survey (assess the system and plan the clean), access (reach the whole run, via and adding access panels), clean (the whole system to the TR19 Grease standard), and certify (verify by inspection and document with a certificate, report and photographs). A proper extraction duct clean runs as a structured process in four stages. Survey: the cleaner assesses the system (its layout, the ductwork run, the grease condition, the access) to understand and plan the job. Access: they establish how to reach the whole run - using the access panels along the ductwork, fitting more where access is inadequate, and safely reaching the fan - since you can't clean what you can't reach. Clean: they clean the whole system to the TR19 Grease standard - canopy, filters, the full length of ductwork (internal surfaces, along the whole run), and the fan - removing the grease throughout. Certify: they verify the clean by inspection (often with before-and-after photographs) and document it (certificate, report, photographs) as your proof. So survey, access, clean, certify - each essential to a real, complete clean. So the four stages: survey, access, clean, certify. This is general guidance.

So the cleaner understands the system before cleaning it - the layout, grease condition and access - and can plan and scope the job properly; a clean without a survey is done blind and may miss parts or under-scope. A survey is the first stage of a proper clean because it means the cleaner understands the system before working on it. They assess the layout (the ductwork run from canopy to fan), the grease condition (how heavy, and where), and the access (how the system can be reached) - which tells them what needs cleaning, how, and to what extent, so they can plan and price the job properly. Without a survey, the clean is done blind: the cleaner doesn't really know the system's layout, where the grease is worst, or whether the access is adequate - so they may miss parts, under-scope the job, or be caught out by poor access. A survey means the clean is planned to the actual system (the whole run known, the access sorted), which also supports honest certification. So the survey is the foundation - understanding the system before cleaning it. So to understand and plan the clean, not work blind. So to know the system before cleaning it. This is general guidance.

Because you can't clean what you can't reach - the enclosed ductwork is cleaned through access panels along its run, and where access is inadequate more panels are fitted; skimping on access leaves parts of the duct (and their hidden grease) uncleaned. Access is critical because the ductwork is enclosed - you can't clean the internal surfaces of a duct you can't get into. So the ductwork is cleaned through access panels along its length (openings that let the cleaners reach inside to clean the internal surfaces), and a proper clean uses the existing panels and fits additional ones where access is inadequate (too few panels, sections unreachable), so the whole run can be reached and cleaned. It also safely reaches the fan. This matters because the hidden ductwork - the internal surfaces along the whole run - is exactly where the grease that matters (the fire risk) builds up, and it can only be cleaned if it can be reached. So a clean that skimps on access leaves parts of the duct uncleaned, with the hidden grease (and fire risk) left in place. Proper access to the whole system is what allows a genuinely complete clean. So because you can't clean what you can't reach. So it's what lets the whole duct be cleaned. This is general guidance.

The canopy, the filters, the full length of the ductwork (all internal surfaces along the whole run), and the fan - all cleaned to the TR19 Grease standard, not just the visible canopy and filters. Cleaning the whole system means cleaning every part of the extraction to the TR19 Grease standard: the canopy (and its internal surfaces); the filters (degreased); the full length of the ductwork (all the internal surfaces, along the whole run from canopy to fan, reached via the access points - removing the grease from inside the duct); and the fan (blades, housing and surrounds). The key is that it covers the whole system throughout - not just the visible canopy and filters (which a superficial clean does), but the hidden ductwork along its entire run and the fan. This matters because the grease that matters most (the fire risk) is in the hidden ductwork and the fan, so a clean of only the visible parts leaves that risk in place. A proper clean removes the grease from the entire system, canopy to fan, along the full run. So it covers the canopy, filters, full ductwork run and fan, to standard. So the entire system, not just the visible parts. This is general guidance.

By the verification and certification - a proper clean is verified by inspection (often with before-and-after photographs of the ductwork) and documented with a certificate, report and photographs; that evidence is your proof, and its absence is a red flag. You know a duct clean was done properly through the final stage: verification and certification. Verified: the cleaner checks the ductwork is actually clean by inspection, confirming the grease is removed - often with before-and-after photographs showing the internal duct surfaces before and after (important because the cleaned surfaces are hidden inside the duct, so the inspection and photographs are how you know it was achieved). Documented: they issue the certificate (to TR19 Grease, dated), the report (of what was cleaned), and the photographic evidence. This documentation is your proof - for insurers, fire safety and compliance. So a proper clean gives you a verified, photographed, certified result you can see and rely on. Conversely, a clean with no verification, photographs or certificate leaves you no proof it was done properly - which is a red flag. So check for verification and certification (with photographs) - that's your proof. So by the inspection, photographs and certificate. This is general guidance.

A proper clean does all four stages - survey, full access, whole-system clean to standard, and verification/certification; a superficial one skips or skimps them (no real survey, poor access leaving the hidden duct, a quick visible wipe, weak or no evidence). The four stages are what distinguish a proper clean from a superficial one. A proper clean: surveys the system (understands it), ensures access to the whole run (fitting panels as needed), cleans the whole system to the TR19 Grease standard (canopy, filters, full ductwork run, fan - including the hidden parts), and verifies and certifies the result (inspection, photographs, certificate). A superficial 'clean' skips or skimps these: no real survey (done blind), poor access (so the hidden ductwork is left uncleaned), a quick wipe of just the visible canopy and filters (the fire-risk grease in the duct and fan left), and weak or misleading evidence (a certificate not reflecting a proper job, or no photographs). So to tell them apart, look for all four stages - especially whether the whole run was accessed and cleaned (not just the visible parts) and whether you got genuine verification and certification with photographs. If stages are missing, it's a superficial clean. So check for all four stages; missing ones mean a superficial clean. So look for survey, full access, whole-system clean and real certification. This is general guidance.