Overview

This task walks a homeowner through clearing lint out of the dryer's lint trap housing, the exhaust duct running to the outside, and the exterior vent hood. It suits anyone whose dryer is taking longer than usual to dry a load, feels hot to the touch, or simply hasn't had its vent cleaned in the past year. Doing this annually (or twice a year for heavy laundry households) keeps the dryer running efficiently and, more importantly, reduces a well-documented fire risk from lint buildup. It's an easy-to-moderate weekend job that takes about an hour with basic tools.

Tools & materials

  • Dryer vent cleaning brush/rod kit (flexible rotating rods)
  • Shop vacuum with hose and crevice attachment
  • Screwdriver (for hose clamps)
  • Dust mask (or N95 respirator if mold/moisture is suspected)
  • Flashlight
  • Work gloves
  • Replacement foil or rigid metal duct (if old one is damaged or is plastic/vinyl)
  • New duct clamps

Steps

  1. Unplug the dryer from its electrical outlet before doing anything else.
  2. If you have a gas dryer, do not touch, disconnect, or attempt to move the gas line or flexible gas connector at any point in this project — leave it completely alone and be careful not to strain it when you move the dryer.
  3. Gently pull the dryer away from the wall, giving yourself enough room to access the back panel without kinking or stressing the exhaust duct; on a gas dryer, only pull it out as far as the flexible gas connector comfortably allows, and never stretch, twist, or kink the connector while repositioning the dryer.
  4. Remove the lint trap/screen from the dryer and set it aside.
  5. Use a vacuum crevice tool or a narrow brush to clean out the lint trap housing (the slot the screen sits in), where lint often packs down over time.
  6. Loosen the clamp or tape securing the exhaust duct to the back of the dryer and disconnect the duct from the dryer only — again, do not touch a gas line while doing this.
  7. Put on a dust mask, since disturbed lint can be dusty, then insert the dryer vent brush/rod kit into the duct opening and work it through the full length of the duct, rotating as directed by the kit's instructions to loosen embedded lint.
  8. If you notice a musty smell or dark, fuzzy buildup inside the duct (signs of trapped moisture and mold from a long-neglected vent), switch from a basic dust mask to a properly fitted N95 respirator and open a nearby window or door for airflow while you continue.
  9. Vacuum out the loosened lint from both ends of the duct using the shop vac and hose attachment.
  10. If the duct is old, crushed, or made of vinyl/plastic (a fire-code and safety concern), replace it with new rigid or semi-rigid metal duct instead of reusing it.
  11. Go outside to the exterior vent hood and remove any lint or debris clogging the opening, using the brush kit or vacuum as needed.
  12. Check that the exterior vent hood's flap or louver opens freely when you blow into the duct from inside and closes fully on its own afterward — a stuck-open or stuck-shut flap should be repaired or replaced.
  13. Reconnect the duct securely to the back of the dryer with the clamp, and reinstall the lint trap screen.
  14. Carefully push the dryer back into place, making sure the duct stays straight and unkinked (and, for a gas dryer, without pulling on the gas connector).
  15. Plug the dryer back in and run a short test cycle to confirm it heats and dries normally, and that air is flowing freely from the exterior vent hood.

Safety warnings

  • If you have a gas dryer, never touch, disconnect, or move the gas line or flexible gas connector — that work is out of scope for this task and should only be done by a qualified professional.
  • Always unplug the dryer before pulling it away from the wall or opening any panel.
  • Wear a dust mask when brushing or vacuuming lint, since it can create airborne dust.
  • If the duct shows a musty smell or dark, fuzzy buildup (signs of trapped moisture and mold), upgrade to a properly fitted N95 respirator and ventilate the area, rather than relying on a basic dust mask.
  • Avoid using a shop vac alone to clean a long vent run — a proper brush/rod kit is needed to dislodge lint packed deep in the duct.
  • Never use plastic or vinyl duct material when reconnecting or replacing sections; use rigid or semi-rigid metal duct only.
  • Make sure the exterior vent flap closes fully when finished so pests and outdoor air can't enter the home.

When to call a pro

  • You have a gas dryer and want a deeper clean that would require disconnecting or moving anything near the gas line or connector.
  • The vent run is long, has multiple bends/turns, and remains clogged or restricted after brushing and vacuuming.
  • You notice damage, rust, or wear on the gas connector or gas line itself (do not attempt to inspect closely or repair this yourself).
  • The exterior vent hood flap is stuck, broken, or missing and needs replacement/repair beyond a simple cleaning.

Cost estimate

$15-$40 for a vent cleaning brush/rod kit if you don't already own one, plus $10-$25 for replacement duct and clamps if needed; a professional dryer vent cleaning service typically runs $100-$200 if you choose to hire it out instead.

Sources