Clothes dryers are one of the more common causes of house fires, and the culprit is almost always lint. The good news is that the risk is highly preventable — it comes down to managing two things, lint and heat, with a couple of simple habits. This guide explains why lint is a fire hazard, how dryer fires start, the warning signs to act on, and exactly how to keep a vented dryer safe in a Melbourne home.
Why Lint Is a Fire Hazard
Lint is the fine, fluffy fibre shed from fabrics as they tumble and dry. It is made of the same cotton, polyester and wool fibres as your clothes — and like those fibres in fine, loose form, it catches fire very easily. A small spark or enough heat will ignite a clump of lint almost instantly.
In a dryer, lint collects in three places: the lint screen, the vent duct, and inside the machine around the drum and heating element. The lint screen is designed to be cleaned, but the lint that passes it builds up in the duct and the machine where it is out of sight. This hidden, accumulating, highly flammable material is what turns a dryer fault into a fire. Remove the lint regularly and you remove the fuel.
How Dryer Fires Start
A dryer fire needs two things together: flammable lint, and enough heat to ignite it. Both come from the same root cause — a restricted vent.
As lint accumulates in the vent duct, it restricts the airflow the dryer needs to carry heat out of the machine. With the heat unable to escape, the dryer runs hotter and hotter. Eventually the temperature inside the machine can reach the point where the accumulated lint — in the duct or around the internal components — ignites. Because lint is so flammable and a dryer contains a lot of air movement, a fire can develop and spread quickly. Damaged or crushed ducting, venting into an enclosed lint-filled space, and mechanical or electrical faults can all contribute, but the lint-plus-overheating combination is the classic mechanism — which is why clearing the vent matters so much.
Warning Signs to Act On
A dryer usually gives warning before it becomes dangerous. Act on any of these:
- The dryer or laundry gets very hot during a cycle — heat that cannot escape because the vent is restricted.
- A burning or hot smell when the dryer runs — possibly overheating lint.
- Clothes take much longer to dry — the vent is restricting airflow.
- Little or no air from the external vent when the dryer is on — a blockage in the run.
- Visible lint around the vent cover, behind the dryer, or building up in the laundry.
Several of these together mean the vent is blocked and the dryer is overheating — clear it without delay and avoid running the dryer unattended in the meantime. See our blocked vent signs guide.
Preventing a Dryer Fire
The fire risk is almost entirely preventable with a short maintenance routine:
- Clean the lint screen after every load. This is the single most important habit — do it every time, not occasionally.
- Have the vent duct cleaned at least yearly. The lint that passes the screen builds up in the duct where you cannot see it. See our cleaning cost guide.
- Vent to the outside. Never into a cupboard, under the floor, or the roof cavity, where lint accumulates in an enclosed space.
- Use good ducting. Smooth rigid duct traps less lint than ribbed flexible duct; keep the run short and free of crushes and kinks.
- Keep the area around the dryer clear of lint, clothing and clutter.
Safe Dryer Use Habits
Beyond maintenance, a few habits reduce the consequence of any fault:
- Do not run the dryer unattended — avoid running it overnight while you sleep or when you leave the house, so you can respond to any warning sign.
- Let the dryer cool between loads rather than running cycle after cycle continuously.
- Do not dry items contaminated with oil, petrol or solvents — these can ignite; line-dry them instead.
- Do not overload the dryer, which makes it work harder and run hotter.
- Have a working smoke alarm near the laundry as a final layer of protection.
What to Do if a Dryer Overheats
If your dryer is overheating, smells of burning, or shows any sign of smoke: stop the cycle and switch the dryer off at the power point. Do not open the door unnecessarily if you suspect a fire inside — adding air can feed flames. If there is any actual fire, smoke or scorching, get everyone out, close the laundry door to contain it, and call 000. Do not use the dryer again until it has been inspected and the vent cleared.
For overheating without fire — a very hot dryer, long drying times, a hot smell — treat it as a blocked vent: stop using the dryer, have the vent cleared, and confirm it is venting properly before resuming. Prevention through regular lint and vent cleaning is far better than relying on response. Call FreshDuct on 0431 918 137 to have a vent cleared and checked.