>Unfortunately that is directional isn't it? TTYL

Actually there is a form of Venturi tube that does not require a static
port and is not directional. It is called a chimney usually. I happen to
know that someone once made an automatic device for wood fired chimneys
that sensed the draft in the chimney and closed a vane if it was cold and
too strong. It was mechanical (including the temperature sensor == bimetal
device).

Peter

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