"Pete C." wrote in message
...
PrecisioNmachinisT wrote:

"Pete C." wrote in message
...
wrote:


Beyond that, there are a few air filter monitors available that
monitor
airflow or pressure and indicate when a filter should be changed
similar
to the indicators on most truck air filters these days.


Airflow or pressure, which one?

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Both types exist.

I call bull****.

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