I though those nice spirally things were a type of wind turbine meant to
draw air out of the pipe/building. I thought they were designed to be
turned in one direction by the wind and that, once spinning, the turbine
would create a vacuum in the pipe. I thought it was mainly passive
ventilation like you would seek to cool an attic, etc. I wouldn't think
it would be used on a stove or plumbing vent as I don't think you want
or need to artificially draw large amounts of air through the vent.
Sealed to the john until the wind stops,
T. Gale
[log in to unmask] wrote:
> ... on stovepipe vents. They spin around when the hot air or whatever
> is coming out. I recognize that they are more or less weathertight.
> But are they designed to spin just diagnostically, to know when the air
> is moving and when not? I like the idea, but it seems like a lot of
> effort just to make sure the air is moving.
>
> Christopher
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To terminate puerile preservation prattling among pals and the
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