How can I verify that work on the ventilation & airflow controlled the original symptom? The safest answer begins by recording location, trigger and timing before assigning a cause.
What the question is testing
Air follows pressure differences and available leakage paths, so the room where a symptom appears may not contain the source. The question becomes more useful when it separates what happened first from what was noticed later.
A practical comparison
Record door and window position Repeat the observation only under safe, comparable conditions and note what stayed unchanged.
Limits and next step
Do not block required ventilation, enter ducts or alter combustion-air paths without competent review. Use the connected atlas guide to build a bounded evidence packet and a clear professional handoff when needed.
Observe→Compare triggers→Repair source→Verify outcome
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