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Duct cleaning - commercial laundry
A commercial tumble dryer does not just move heat and moisture - it moves lint, and lint collects in the ducting run after run. It is soft, it is dry, and it is highly combustible, which is why a laundry duct is a fire-risk system, not just a ventilation one.
The short answer
There is no single interval for a laundry duct, because the right frequency is driven by how hard the dryers work. Lint accumulates continuously in tumble dryer ducting, and because it is dry, fine and highly combustible, a build-up is a genuine fire risk right next to a heat source. A busy commercial laundry can need its ducting cleaned far more often than an occasional one - the principle is that the duct is cleaned before lint accumulates to a level that carries fire risk or chokes the airflow.
The material
Every load a tumble dryer runs sheds fibres, and those fibres - lint - are carried into the exhaust ducting along with the hot, moist air. Lint filters catch some of it, but not all, and what passes settles along the duct run. The trouble is what lint is: fine, dry cellulose and fabric fibre, loosely packed with plenty of air in it. That is close to an ideal fuel - it ignites easily and burns fast - and it is accumulating inside a duct carrying heat from a dryer.
That combination is why a laundry duct is treated as a fire-risk system. Tumble dryer and lint-related fires are a well-known cause of laundry and building fires precisely because the fuel and the heat source sit together in the same run. Unlike ordinary dust, which is mostly a hygiene and airflow matter, lint in a dryer duct is first and foremost a combustion hazard - which changes how seriously the cleaning has to be taken.
What drives frequency
Because lint builds with use, the correct cleaning frequency follows usage more than the calendar. A launderette or commercial laundry running dryers for many hours a day, every day, loads lint into its ducting far faster than a small operation drying a few loads. The length and shape of the duct run matters too - long runs, bends and any horizontal sections give lint more places to settle and accumulate, so the same dryer on a more awkward duct fouls sooner.
The type of work adds to it: heavy, fibre-shedding items like towels and bedding produce more lint than lighter fabrics. So a high-throughput laundry handling towelling on a long duct run needs cleaning on a much shorter cycle than a light user on a short, straight run. The honest answer to how often is therefore set by looking at the actual system and its workload, not by quoting a universal number that would be wrong for most sites.
The two failures
A fouled laundry duct fails in two ways, and both get worse as lint accumulates. The first is the fire risk already described: a duct lined with dry lint next to a heat source is a fire waiting for an ignition, and the more lint, the greater the load and the faster any fire would run. This is the serious failure, and the reason lint is never something to let build.
The second is performance. Lint narrowing the duct restricts the airflow the dryer needs to exhaust its hot, moist air. A choked duct makes the dryer work harder, run longer, and cost more to run, while drying less effectively - and the strain and heat build-up can shorten the dryer's life and, itself, raise the fire risk further. So even setting the fire hazard aside, a lint-clogged duct is quietly costing money in energy and drying time. Regular cleaning addresses both the danger and the drag at once.
Setting a cycle
The practical approach is to set a cleaning cycle matched to the specific laundry and hold to it. A heavy commercial user will need frequent cleaning; a lighter one, less often - but every laundry needs a defined interval rather than waiting for a problem to show. Waiting for reduced drying performance or a scare is waiting too long, because by the time the effects are obvious the lint load has already been sitting at a fire risk for a while.
Cleaning covers the whole exhaust run, not just the accessible first stretch, because lint settles along the length and the far sections are often the most neglected. Once a sensible interval is established for the site's usage, keeping to it means the duct never reaches the lint load that carries real fire risk or seriously chokes airflow - which is exactly the point of cleaning it on a cycle rather than in response to a problem.
The takeaway
How often a laundry duct should be cleaned has no universal answer, because it depends on how hard the dryers run, how the duct is arranged and what is being dried. A busy commercial laundry needs it far more often than a light user. But the underlying rule is constant: clean before lint builds to a level that carries fire risk or restricts airflow - which for a hard-working site means a genuinely regular cycle.
What makes this different from ordinary duct cleaning is the priority. Lint is a combustible material accumulating beside a heat source, so a laundry duct is a fire-safety matter first and an efficiency one second. Setting a cleaning interval matched to the actual usage, and keeping to it, is how a laundry keeps that fire load from building - and gets better, cheaper drying as the bonus.
Questions
There is no single interval - it depends on how hard the dryers run, the length and shape of the duct, and what is being dried. A busy commercial laundry needs it far more often than a light user. The rule is to clean before lint builds to a fire risk.
Because it is fine, dry, combustible fibre accumulating inside a duct that carries heat from the dryer. That puts an easily-ignited fuel right next to a heat source, which is why dryer lint is a well-known cause of laundry fires.
High throughput, long or bendy duct runs where lint settles, and heavy fibre-shedding items like towels and bedding. A high-volume laundry drying towelling on a long duct needs cleaning far more often than a light user on a short run.
Two things worsen together - the fire risk from accumulating lint, and lost airflow that makes the dryer work harder, run longer, cost more and dry less well. Both get worse the longer cleaning is left.
Yes. Lint settles along the entire exhaust run, and the far sections are often the most neglected. Cleaning only the accessible first stretch leaves the build-up where it is least likely to be noticed.
First and foremost, yes. Because lint is combustible and accumulates beside a heat source, a laundry duct is a fire-safety matter before it is an efficiency one - which is why it is cleaned on a cycle rather than left until a problem shows.
We clean commercial dryer exhaust ducting end to end on a cycle matched to your usage - clearing the combustible lint before it builds into a fire risk.
