What the observation can and cannot tell you
An apparent draft change can involve the appliance, vent path, obstruction, deposits or building pressure. It is a symptom description, not a diagnosis. Avoid repeated test fires to narrow down the cause.
Build a useful appointment brief
Describe what happened during prior use, any recent building or appliance changes, which other equipment was operating. Share existing reports and safely taken photographs. Unknown history should be marked unknown; do not reproduce a concerning event to collect evidence.
Questions before you authorize work
Ask how the assessment will consider both the appliance and the building, which tests are appropriate for a professional and what remains uncertain after the visit.
Request the findings, access limitations, proposed work and unresolved questions in writing. A symptom disappearing does not establish that the system is safe to operate.
Check the source
References & further reading
- CSIA homeowner resources ↗
Annual inspections, cleaning and homeowner questions.
- U.S. Fire Administration: heating fire safety ↗
Fireplace and heating safety reminders.
Prepared by Chimney Sweep Guide editorial. General homeowner information; no claim of an on-site inspection or professional certification. Suggest a correction.