Why Buildings Have This Spinning Metal Ball on the Roof ???? - Video

Have you ever noticed that spinning round object on top of buildings and wondered what it actually is? It’s called a “Whirly Bird.” You’ve probably seen them mostly on the roofs of warehouses and factories. In places like these, a lot of people and machines are constantly working, which creates a huge amount of heat and humidity inside the building. That’s why these ventilators are installed — to push the hot air out. The coolest part is that they work without using any electricity. They’re so lightweight that even a small breeze or rising hot air can make them spin. And as soon as they start rotating, the hot air inside gets pulled out while fresh air flows back in.

#shorts #mindsy #usa