A flue inspection examines the ductwork and passages that carry combustion gases from a furnace or boiler to the outside atmosphere. This inspection identifies blockages, cracks, corrosion, and improper venting that could allow dangerous gases like carbon monoxide to enter the living space. Technicians use visual examination and sometimes video cameras to assess flue condition and ensure compliance with building codes.
Technical Details
Flue inspections verify that pipes maintain proper slope (typically 1/4 inch per foot for horizontal runs), check for separation at joints, and confirm adequate clearance from combustible materials. Inspectors look for rust, deterioration, and evidence of previous leaks. The inspection covers the entire path from the appliance to the termination point outside.
Safety and Compliance
Blocked or damaged flues create serious health hazards by restricting exhaust flow. The National Fire Protection Association (NFPA) requires annual inspections for oil and gas appliances. Many jurisdictions mandate flue inspections during home sales and before heating season. Proper flue function directly prevents carbon monoxide poisoning and reduces fire risk.