Venturi Chimney Cap

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Venturi chimney cap.

Superior chimney s vacu stack chimney caps cure most wind related fireplace smoke back up issues via the venturi effect which utilizes wind movement hitting this cap to increase strength in positive. Basically a venturi is a tube with a constricted. The secret to getting a flue to draw is to have a constriction in the chimney. A concentric shroud venturi cowl or parallel rain excluder will allow the smoke to travel upwards and significantly reduce the amount of rain entering the chimney.

The streamline flow of the wind around the vacu stack prevents wind from blowing into the chimney even when the wind is deflected downward. This work on the venturi principle and is named after an italian physicist giovanni batista venturi 1746 1822. Air moving up the chimney has to compress to get through the gap of the constriction once through the chimney opens out and the pressure in the rising. And as i explored that notion i became convinced that a chimney cap designed to create a venturi effect would be the answer to my problem.

Because rain usually falls at an angle the rain hits the inside sides of the shroud travels down the sides and out the bottom without entering the chimney. The vacu stack creates a venturi that causes flue gases to flow up and out of the chimney. There are no moving parts to bind or malfunction. The present invention relates to a chimney with venturi effect 1 used in discharging the waste gases 50 to outside 60 on the configuration using any kind of fuel such as wood coal fuel oil or natural gas for different purposes directing the wind 70 coming from any direction to the chimney inlet 11 therefore comprising directing flap gates 21 and directing flaps 20 improving.