Combustion testing the flue gases of an attic furnace can sometimes be challenging, but it's so important to do! Using the Wohler A450 to test the oxygen, temperature, carbon dioxide, and carbon monoxide content of the gases from an 83% efficient furnace.
Learn more about testing at: https://BuildingPerformanceWorkshop.com
See combustion testing demonstrated on the 'Home Diagnosis' TV series: https://homediagnosis.tv/ep207-slow-burn