How to Install an Outdoor Lint Trap on a Dryer


If your dryer exhaust duct is more than 25 feet long, static pressure drop inside the vent restricts airflow and lowers dryer efficiency. This results in extended drying time, increased in-home humidity and unnecessary wear and tear on your dryer’s exhaust fan. In addition to installing a dryer booster fan near the top of the vent, fit a secondary lint trap between the dryer and the booster fan to minimize the chances of a vent fire.

Things You'll Need

  • Leaf blower
  • Rag
  • Wed/dry vacuum
  • Tin snips
  • 4-inch-diameter smooth galvanized metal tubing (if required)
  • Secondary lint trap
  • Aluminum foil tape
  • Disconnect the vent pipe transition from the back of the dryer as directed in the dryer instruction manual.

  • Insert a leaf blower tube into the vent pipe from the bottom, seal the joint with a rag, and turn the machine on to blow as much lint as possible out of the vent to the outside.

  • Push a wet/dry vacuum hose into the outside vent cap. Turn the machine on and work the hose in and out as far as possible to clear out any remaining lint inside the duct.

  • Cut out a 6.5-inch section from the exhaust duct leading up from your dryer, at eye level, with a pair of tin snips. If you the dryer is fitted with non-UL approved flexible vinyl tubing, replace all the ductwork between the dryer and the outer vent cap with 4-inch-diameter smooth galvanized metal tubing; this will lower the chances of a duct fire and reduce the pressure drop inside your exhaust vent.

  • Reconnect the dryer exhaust transition. Slide the lower inlet tube of a secondary lint trap into the precut duct leading up from your dryer as directed in the lint trap installation instructions. Rotate the lint trap so that the transparent spring-loaded inspection panel faces the front of the dryer.

  • Insert the lint trap exhaust outlet tube into the upper section of the existing galvanized metal ductwork.

  • Seal all ductwork joints securely with adhesive aluminum foil tape.

Tips & Warnings

  • Make a habit of cleaning your dryer lint trap and inspecting the secondary lint trap filter every time you use the dryer. If the secondary lint trap becomes clogged, remove excess lint from the filter with a vacuum cleaner.
  • If you have and older home fitted with a restricted 2-1/2-inch dryer vent cap, replace it with a 4-inch unit fitted with a series of flappers to improve venting efficiency.

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