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Dryer vent cleaning — iced outdoor flap vs lint cake first

Dryer vent

Before a full dryer vent cleaning brush run, check whether an iced outdoor flap is shut versus a lint cake deeper in the hose when the dryer takes two cycles.

outdoor dryer vent flap iced vs lint cake — related household tip photo
Photo: Gustav Monckmeier / Wikimedia Commons (Public domain)

When a load needs two cycles, start outside: an iced outdoor flap can mimic a deep clog. Confirm the flap moves freely before a full dryer vent cleaning brush so you do not chase lint that is not there.

Free an iced outdoor dryer vent flap before you brush for lint

  1. On a cold day, watch the outdoor hood during a timed empty cycle. If the flap stays glued shut with clear ice, that alone can make the dryer take two cycles.
  2. Warm the exterior hood gently (warm water pour or brief hair-dryer on low from outside only) until the flap lifts — do not torch or pry the damper hard.
  3. Once the flap swings freely, feel for a strong warm exhaust. Weak flow after the flap frees means lint deeper in — then brush.
  4. Clear any ice rim and leaves from the hood lip so the flap can fall closed when the dryer stops.

Honest stop: never heat a gas dryer vent with an open flame, and do not run the dryer if you smell gas — call the utility or a qualified tech.

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