Several conditions can produce the same observation. An on-site assessment should test plausible causes and document limitations before a repair is selected.
Can I keep using the fireplace or appliance?
Stop use. If a carbon-monoxide alarm sounds, anyone feels ill, or smoke is rapidly filling the home, move to fresh air and contact emergency services.
What should I photograph or record?
When the smoke appears: startup, refueling, steady burn or shutdown Weather, wind and outdoor temperature Which fans, dryers or other fuel-burning appliances were operating Fuel type, moisture and recent system changes
What type of company should I contact?
Look for a company with relevant experience in smoke and draft problem diagnosis and your appliance type. Confirm services, qualifications and current insurance directly.