Inspecting Residential and Commercial Properties
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How Not To

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Flue gas spillage at furnace
Fog on inspection mirror indicates leakage between draft hood and sheet metal furnace. This connection should be properly sealed by a qualified heating contractor to prevent flue gas entry into the living space.
Flue gas spillage at furnace
Rust is a good indicator
Foggy mirror shows spillage
Flue gas leakage at new furnace
Flue gas spillage at water heater fire box door

 
   
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Inspecting Residential and Commercial Properties in the Bay Area and Western States since 1979