Exhaust can lower indoor pressure and draw air through foundation or floor leaks.
The short explanation
Exhaust can lower indoor pressure and draw air through foundation or floor leaks.
What to compare
Compare location, timing, weather or operating cycle, then open the matching Living House layer to see the plausible routes.
What would strengthen the explanation
A repeatable trigger and a physical route through the nearby assembly are stronger than appearance alone.
Next step
Document the original condition and choose the least destructive check that can separate the leading explanations.
Observe→Compare triggers→Repair source→Verify outcome
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