How often should you replace a dryer vent hose?
Updated July 2026
Replace the flexible transition duct between the back of the dryer and the wall about every 10 years, and replace ribbed foil or white plastic ducting right now regardless of age. That accordion-style hose is a lint magnet: its ridges snag the fibers the airflow should carry out, and packed lint next to a heat source is a leading ignition point in the roughly 2,900 home dryer fires the U.S. Fire Administration counts each year. The fix is smooth rigid or semi-rigid metal, and it is cheap.
What changes the interval
| Your situation | Interval | Why |
|---|---|---|
| Smooth rigid metal duct | Every 10 years or so | Lasts longest; lint slides through instead of catching |
| Semi-rigid aluminum transition | Every 8–10 years | Acceptable behind the dryer; inspect it for crushing |
| Ribbed foil (slinky) duct | Replace immediately | Traps lint and code prohibits it inside walls |
| White vinyl/plastic duct | Replace immediately | Melts and burns; never allowed for a dryer |
| Duct crushed behind a tight install | Replace now | A pinched duct chokes airflow and overheats the dryer |
| Vent cap flap stuck or screened | Fix or replace with the duct | A stuck flap or bird screen backs lint up the whole run |
| Long run served by a booster fan | Clean fan and duct yearly | Extra hardware is one more part to keep lint-free |
The cost of skipping it
What the wrong duct costs: flexible foil and plastic ducting sits behind a large share of dryer fires precisely because it traps lint and, for plastic, is itself fuel. Beyond fire, a lint-choked or crushed duct strangles airflow so the dryer runs hot and slow, doubling dry times and burning out the heating element early. Property loss from dryer fires runs into the tens of millions of dollars a year nationally. New semi-rigid or rigid metal ducting is only $15–40, and pairing the swap with a yearly duct cleaning is the whole safety story (see the cost of dryer-vent neglect).
How to do it (30 minutes · DIY, $15–40 in parts)
- Unplug the dryer (and shut the gas valve if gas), then pull it away from the wall.
- Loosen the clamps and remove the old transition duct from both the dryer outlet and the wall duct.
- Vacuum lint from the dryer’s exhaust port, the wall duct opening, and the floor behind the machine.
- Cut a length of smooth semi-rigid aluminum duct as short and straight as the space allows; keep it under 8 feet with minimal elbows.
- Clamp it to the dryer and the wall fitting with worm-gear clamps (not tape), keeping the joints sealed and gentle.
- Slide the dryer back without crushing the duct, run a cycle, and confirm strong airflow at the outside vent hood.
Knowing the interval is the easy half. OnOtto reminds you at the right interval, and it won't let you snooze it into next year. Tasks persist until they're done, and completing dryer duct replacements schedules the next one automatically.
Put this on autopilot, free for 30 daysFrequently asked questions
What kind of dryer duct is actually safe and code-compliant?
Smooth-wall rigid metal for the run inside walls or ceilings, and a short length of semi-rigid metal for the visible transition behind the dryer. Both flexible foil (the ribbed "slinky" type) and white plastic vinyl are widely prohibited by code because they sag, trap lint, and, for plastic, burn. Keep the transition piece as short and straight as possible, generally 8 feet or less with as few bends as you can manage.
How is the transition hose different from the vent duct in the wall?
The transition duct is the short, visible, often flexible piece between the dryer and the wall connection; the vent duct is the fixed rigid run inside the wall, floor, or ceiling out to the exterior hood. The transition piece is the one you replace periodically because it flexes and gets crushed; the in-wall duct usually just needs annual cleaning unless it is damaged or made of the wrong material.
How often do I clean the duct versus replace the hose?
Different jobs on different clocks. Clean the full vent run once a year (every 6 months for big households or long runs) to clear the lint that builds up no matter what. Replace the transition duct roughly every 10 years, or immediately if it is foil, plastic, crushed, or torn. Cleaning keeps a good duct clear; replacement swaps out a duct that is old or was the wrong material to begin with.
Can a longer or curvier vent run cause problems?
Yes. Every foot and every elbow adds resistance and a spot for lint to pile up, which is why codes cap the equivalent length (commonly around 25–35 feet total, minus roughly 5 feet per 90-degree bend). Long or twisty runs dry slower, clog faster, and need cleaning every 6 months. Keeping the transition piece short and straight and using gradual metal elbows is the easiest way to stay within margin.