Why Do Wind Beaters And Vaccu-Stacks Work?
It’s time for a little history and science. Way back in 1738 a Swiss mathematician named Daniel Bernoulli
developed a principle stating that as the speed of a moving gas increases, the pressure within that gas
decreases. A few years later an Italian scientist named G.B Venturi used this principle to demonstrate that as
you move air quickly past an opening the pressure on the other side decreases and literally sucks the air out.
The Venturi Effect was born!
We experience the Venturi Effect each day we use a car or truck. The carburetor mixes air and gas together
using the Venturi Effect before it’s fed into the cylinders where it’s ignited.
The WindBeater and Vaccu-Stack take advantage or the Venturi Effect. They are both constructed of two
concentric hoods which surround the chimney opening. The hoods are positioned so the adjacent bands
overlap, and so the unit presents a spherical image to the wind regardless of the wind direction.
When the wind blows, the air is forced around the unit rather than through its openings. This creates the
Venturi Effect at the top of the chimney. The pressure inside the chimney is decreased and Bernoulli’s
principle goes to work, forcing gas in the chimney up towards the top, increasing the draft. The harder the
wind blows, the more draft will increase. And it doesn’t matter which direction the wind is blowing!
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