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Here's what we were working with. The exterior vent cap was heavily soiled and partially propped open - exactly the kind of gap a bird can squeeze through. Once inside, nesting material packed the duct tight. Sticks, debris, droppings. The whole run was compromised from the outside cap all the way back through the attic.
We pulled the bird and nest material out safely, then got into the attic to assess the full situation. The duct run showed contamination along the interior walls - that grime coating the inside of the pipe doesn't just affect airflow, it's also a hygiene problem sitting directly in the path of air moving through your home. We cleaned it out completely.
After the duct was cleared, we installed a proper bird guard over the exterior cap - a clean grid-style cover that lets air exhaust freely while keeping animals out for good. The damaged duct wrap in the attic was also addressed while we were up there. When you're already in, it makes sense to fix everything you find rather than leave a half-done job behind.
A blocked bathroom exhaust vent isn't just an inconvenience. It can lead to moisture buildup, mold risk, and in some cases a real mess if an animal gets further into the system. If your bathroom fan sounds weak, rattly, or just off - don't put it off. That vent runs straight through your attic, and what's living in it matters.