TL;DR
If your dryer vent hose is flexible foil or plastic vinyl, replace it with rigid or semi-rigid metal duct rather than cleaning it, because those materials sag, trap lint, and are widely disallowed by code. Clean a metal duct rather than replacing it, unless it is crushed, torn, or disconnected. Clothes dryers are a leading cause of home appliance fires, and lint buildup is the leading cause within that.
The Verdict: Material First, Condition Second
Ask two questions in order. What is the duct made of, and what shape is it in?
If the answer to the first is thin foil accordion hose or white plastic vinyl hose, replace it. Those materials have ridged interiors that catch lint, they sag between supports and collect it, and vinyl in particular is combustible. Most current codes call for rigid or semi-rigid metal duct instead.
If the duct is already rigid or semi-rigid metal, then judge condition. Crushed sections that have collapsed behind the dryer, tears, holes, separated joints, and a run that has come off the wall fitting all mean replacement. Everything else means cleaning.
This is the one entry in this whole category where safety, not cost, drives the decision, so the usual weighing of clean it or replace it decisions does not really apply. When in doubt, replace.
Why Is Dryer Lint Actually Dangerous?
Lint is fine, dry, highly combustible fiber, and a dryer pushes hot air through the duct on every cycle. When lint accumulates, airflow drops, the dryer runs longer and hotter to finish a load, and that combination of heat and fuel is what fire authorities identify as the leading factor in dryer fires.
Failure to clean is consistently the most common contributing cause. That is a maintenance failure rather than an equipment failure, which means it is one of the few household fire risks a homeowner can meaningfully remove with an afternoon of work.
Source: national fire safety authorities and fire incident reporting data
What Are the Warning Signs of a Blocked Vent?
Clothes taking noticeably longer than usual to dry is the clearest early sign, especially when a single load needs two cycles. Others include the dryer or the laundry room getting unusually hot during a cycle, a burning or musty smell, and no visible airflow at the outside vent hood while the dryer runs.
Check the outside hood directly. The damper flap should open when the dryer is running and you should feel a strong warm airflow. A flap that stays shut, a hood packed with lint, or a bird nest in the opening all mean the run is blocked.
Lint appearing around the door seal or on the floor behind the dryer is another indicator, since it usually means air is backing up rather than exiting.
How Do You Clean a Dryer Vent Duct?
Unplug the dryer, and for a gas dryer shut off the gas supply at the valve before moving it. Pull the dryer out, disconnect the duct at the dryer, and vacuum the lint from the dryer's exhaust port and from the duct opening in the wall.
Then run a duct brush through the length of the run. Rotating brush kits with flexible extension rods generally run $20 to $50 and work with a drill, feeding through from one end while a vacuum catches what comes back. Go from both ends where you can reach them, and finish at the outside hood.
Reconnect with metal foil tape or clamps rather than sheet-metal screws, because screw points project into the duct and catch lint. Then run the dryer on air-fluff for a few minutes and confirm strong airflow at the outside hood.
Clean the lint screen after every load and wash it with warm soapy water a few times a year, since dryer sheet residue builds an invisible film that restricts airflow. That is the same logic as washable and replaceable vacuum filters and whether a furnace filter can be cleaned: the filter is where airflow lives or dies.
How Often Should It Be Done, and When Do You Call Someone?
Most guidance is once a year for a typical household, and every six months for large families, homes with pets, or dryers with long or complicated duct runs. Check the outside hood seasonally regardless.
Call a professional dryer vent cleaning service when the run is longer than roughly ten to fifteen feet, when it has multiple elbows, when it goes up through a wall or across an attic or crawlspace, or when you cannot reach both ends. Professional dryer vent cleaning generally runs $100 to $250 depending on length and access.
Also call one if you find evidence of a rodent or bird nest in the duct, since removing it is only half the job and sealing the entry point is the other half, which is pest control and exterior repair work rather than cleaning. And if you have ever seen scorching or smelled burning, stop using the dryer and have it inspected.
What Should You Replace It With?
Rigid metal duct is the best choice, with the smoothest interior and the least lint retention. Semi-rigid aluminum is the usual compromise for the short connection behind the dryer, where a little flexibility is needed to slide the machine into place.
Keep the run as short and as straight as possible, since every elbow adds resistance equivalent to several extra feet of duct. Avoid crushing the hose against the wall when pushing the dryer back, which is the most common cause of a collapsed connector, and use a periscope-style rigid connector in tight spaces.
Never vent a dryer into a crawlspace, attic, garage, or indoor lint trap box. Dryers exhaust large amounts of moisture, and directing that into an enclosed space creates a damp problem that becomes a mold remediation job. Vent outdoors, through a hood with a working damper.
Materials are inexpensive: rigid duct sections generally run $8 to $20 each, semi-rigid connectors $15 to $35, and a vent hood $10 to $30. That is a small line item next to appliance repair generally, which is worth remembering when repairing or replacing a washing machine comes up in the same laundry room.
Where Laundry Upkeep Fits Overall
The laundry room quietly generates more dust than most rooms in a house, because every cycle sheds fiber. Lint settles behind and under the machines, on top of them, and along baseboards, and it is one of the easiest wins in a deep clean.
Pull both machines out once or twice a year, vacuum the floor and walls behind them, check the washer hoses for bulges or cracks while you are back there, and wipe the top of the dryer where lint accumulates unnoticed. If you are weighing what to keep doing yourself against what to hand off, look at house cleaning services as a whole rather than one room at a time.
FAQ
How often should you replace a dryer vent hose?
Replace foil or vinyl flexible hose right away with rigid or semi-rigid metal duct, since those materials trap lint and are widely disallowed. A metal duct in good condition does not need routine replacement, only annual cleaning, unless it is crushed, torn, disconnected, or has separated joints.
Are foil dryer vent hoses safe?
Thin foil accordion hose and white plastic vinyl hose both catch lint in their ridges and sag between supports, and vinyl is combustible. Most current codes call for rigid or semi-rigid metal duct instead. If you have either type behind your dryer, replacing it is a worthwhile safety upgrade.
How do you know if a dryer vent is clogged?
The clearest sign is clothes taking much longer than normal to dry, especially needing two cycles. Others include a hot laundry room, a burning or musty smell, lint appearing around the door seal, and no strong warm airflow at the outside vent hood while the dryer runs.
How often should a dryer vent be cleaned?
Once a year for a typical household, and every six months for large families, homes with pets, or long duct runs. Clean the lint screen after every load, and wash it with warm soapy water a few times a year to remove the invisible dryer sheet film that restricts airflow.
Can you clean a dryer vent yourself?
Yes for a short, accessible run. Unplug the dryer, shut off the gas at the valve for a gas dryer, disconnect the duct, vacuum both openings, and run a rotating duct brush through the length. Call a professional for long runs, multiple elbows, or ducts through attics and crawlspaces.
Can a dryer vent indoors instead of outside?
No. A dryer exhausts a large amount of moisture along with the hot air, and directing that into a crawlspace, attic, garage, or an indoor lint box creates a damp problem that becomes a mold remediation job. Always vent outdoors through a hood with a working damper.
Check the material first. Foil or vinyl behind the dryer is a replacement job today, and metal duct is an annual cleaning job. Every home is different, so the right cleaning plan depends on size, condition, and what you want covered. Get a quote and we will walk you through it.