For a ventilation problem
Check intended airflow, blocked paths, fan operation, outdoor conditions and pressure clues without defeating safety controls.
Use the sequence without turning it into permission.
Safe checklistFor a ventilation problem: a safe house-symptom checklist
Check intended airflow, blocked paths, fan operation, outdoor conditions and pressure clues without defeating safety controls. The checklist separates observation, documentation, avoid actions, stop boundaries and the next handoff.
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