Everyone checks the lint screen; almost no one walks outside. But the final foot of your dryer's vent run — the hood and flap on the exterior wall — lives full-time in South Sound weather, and around here that's a career of rain, moss, wind-driven debris and the occasional feathered tenant. A surprising share of "dryer takes forever" calls end at that wall, not inside the machine.
What our climate does to a vent hood
The flap stops flapping. Louvers and dampers are supposed to swing open with airflow and seal when the dryer rests. Grit, lint paste and corrosion stiffen the hinge; moss — which colonizes every north-facing surface in Thurston County — creeps over the hood and physically wedges louvers. A flap stuck half-shut throttles the entire run; stuck open, it invites the next problem. Birds move in. A warm, dry, wind-sheltered tube is prime spring real estate, and a starling nest is a total blockage with a smell. Winter condensation: hot moist exhaust meeting a cold duct run drops water inside the pipe, and that damp lint packs into concrete-grade clogs — long runs through crawlspaces and garages are the classic victims.
The five-minute outdoor test
Run the dryer on high, walk outside, and put a hand at the hood. You want a confident, warm, steady stream and a flap standing fully open. A limp lukewarm breeze, a flap that barely trembles, visible lint beard on the louvers, or moss bridging the hood — each one convicts the exhaust path before a single panel comes off the machine. While you're there: the flap should swing freely by finger and fall closed on its own.
What's yours and what's ours
Yours: brushing the hood clear, trimming the moss, replacing a cheap plastic flap that's given up (hoods are hardware-store parts), and never — ever — screening the outlet with mesh, which becomes a lint filter that clogs in weeks. Ours: the full run cleaned from machine to hood, the blower housing opened where damp lint packs deepest, and an exit airflow measurement so the fix is a number, not a feeling. Around Olympia, Lacey and Tumwater we end every heat-related dryer repair at that outside wall — because in this climate, that's where the story usually started.
