Temp. of ductwork

[Phillip]

While in the attic I took the temp of the metal ductwork and the return flex ductwork.

The house only has ridge vents installed and its warm up in the attic.

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[Marc]

It was likely hotter than that....the emissivity of galvanized sheet metal is low. Typical emissivity values. Scroll down to 'Steel Galvanized New'.

Marc

[David Meiland]

Every user of an infrared tool like that needs to understand emissivity.

If you are using one, keep a roll of Scotch 33 electrician's tape with it, and put a piece of tape on the metal you want to measure. Assuming the emissivity setting of the tool is around .95, you should be fairly close.

[Phillip]

The temps where shot just for me. In yesterday after noon inspection the ductwork was only 108. This house had better ventilation then the first house.