The main fire risk in a commercial dryer is lint: it collects in the lint screen, the drum housing, the blower and the exhaust duct, and when airflow drops, temperatures climb until lint ignites. The best protection is to clean the lint screen after every load, keep the exhaust duct clear and correctly installed, and never run a dryer that is overheating, smells burnt or has damaged parts. If you see smoke or flames, get everyone out, call 911 and do not try to fight the fire in the duct.
Laundries and on-premise laundry rooms in hotels, gyms, clinics and apartment buildings run dryers hard, often back to back for hours. That makes lint control a daily task rather than an annual one.
Warning signs to act on
| Sign | What it can mean | Action |
|---|---|---|
| Dry times getting longer | Restricted exhaust or heat loss | Clean the screen, check the outside hood, schedule duct inspection |
| Drum or door hotter than usual | Overheating, failed thermostat or high airflow restriction | Stop use and call |
| Burning smell or scorched lint | Lint on a hot surface or a burner problem | Stop use immediately and call |
| Lint around the outside hood or on the roof | Duct leaking or poorly terminated | Arrange duct cleaning and inspection |
| Flapper at the hood does not open | Blocked or stuck termination | Clear it; call if airflow remains weak |
| Lint build up inside the cabinet or around the burner | Lint bypassing the screen or a damaged screen | Technician cleaning and inspection |
| Gas smell | Leak at supply, valve or burner | Leave the building and call the gas utility from outside |
Daily and weekly habits
- Clean the lint screen after every load, not at the end of the shift.
- Wash the screen with soap and water regularly to remove fabric softener film.
- Check that the screen is not torn or missing.
- Feel the airflow at the outside hood while the dryer runs.
- Do not dry items that have held flammable liquids, such as cooking oils, gasoline or cleaning solvents. Clothes and rags with oil can heat up on their own and ignite even after the cycle ends.
- Remove clothes promptly at the end of the cycle; do not leave warm loads sitting in the drum.
The duct matters as much as the dryer
Exhaust ducts should be made of rigid metal, as short and straight as possible, and run directly to the outside. Plastic or foil flexible ducts trap lint and can burn. Ducts that join a shared main can push air back into other machines. Screws that protrude into the duct catch lint. These are installation issues that should be fixed by qualified duct installers and checked against the dryer maker’s instructions and local code.
Duct cleaning is a specialist job. A technician can clean the dryer cabinet, burner area and blower, and can measure airflow, but a long vertical run or a rooftop termination usually needs a dedicated duct cleaning crew. Keep a written record of when each dryer and duct was last cleaned.
If you smell gas or smoke
If you smell gas, leave the building immediately, then call the gas utility from outside. Do not turn on or off any switches, do not use a phone inside, and do not try to relight a pilot. If you see smoke or fire, get everyone out and call 911. A dryer fire in a duct can spread inside walls. Do not open the dryer door if you suspect a fire inside, since fresh air can feed it.
Maintenance a technician provides
- Cleaning of the cabinet, burner area, blower housing and heat chamber.
- Testing of thermostats, high limit and safety switches.
- Checking gas pressure, flame quality and ignition on gas dryers.
- Inspecting heating elements and wiring on electric dryers.
- Reviewing the duct path, termination and airflow against the maker’s requirements.
We explain what we find in plain terms. If the problem is a duct installation that needs a specialist, we say so rather than patching around it. A dryer with a safety device that has been bypassed should be taken out of service until it is repaired.
Insurance, records and training
Keep cleaning records, post a sign by each dryer that reminds users about lint and flammable materials, and train staff on what to do if they smell gas or see smoke. Check with your insurance provider and local fire code about requirements for your type of building. Different cities and buildings have different rules.
We repair commercial dryers for hotels, gyms, clinics and laundries in Miami, Los Angeles, Houston, New York and San Diego. We are an independent repair company, not affiliated with any maker. Same-day appointments are often available, and our work carries a 30-day warranty.
FAQ
How often should the lint screen be cleaned?
After every load. In commercial settings, a clogged screen is the fastest way to lose airflow.
Can I clean the duct myself?
Light cleaning near the dryer is fine with the power off. Full duct cleaning, especially on long or vertical runs, should be handled by a specialist.
Why do oily rags catch fire in dryers?
Oils oxidize and give off heat. In a warm pile, that heat builds until the material ignites. Wash them separately and dry flat in open air.
When should a dryer be taken out of service?
Immediately if it smells burnt, runs far too hot, has a damaged guard or safety switch, or smells of gas.