Poor venting can cause soot and shutdowns

https://www.scribd.com/document/1032971848/Everett-WA-Water-Heater-Repair-Services-Same-Day-Availability-186339

Poor venting can cause soot and shutdowns. We repair flues, add draft hoods, and correct clearances, or move to direct‑vent or power‑vent replacements for safety.