Ask Tim: How do I verify the minimum outside air flow through my dampers?

This is an easy task and can be quickly accomplished by following these easy steps:

1)Take temperature readings of the outside air flowing through the dampers-the returned air and the mixed air.
2)Make sure the mixed air temperature is taken before any heating or cooling coils.
3)Plug the temperatures into the following formula:
%OA=(return air temp-mixed air temp)/(return air temp-outside air temp)X100%

Example: 68-42/68-32=72.222(100)=72%

This formula works best when there is a substantial difference between the temperatures. You can also measure CO2 and substitute those readings for temperatures using the same formula.

With over twenty-six years of experience, Tim possesses substantial knowledge of the HVAC industry.Tim worked at The Georgia Trane Company for twelve years in Parts Management, Outside Sales, and Technical Support; in addition, he also taught several training classes on Trane equipment.
Tim will be bringing teaching chiller classes for Stromquist & Company.

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