![What is this black round thing on the roof of this transit company van? It was spinning fast. : r/whatisthisthing What is this black round thing on the roof of this transit company van? It was spinning fast. : r/whatisthisthing](https://external-preview.redd.it/srFjPkvF_1Ji90VF6xh2uEWiQfEW3sTHzsXHu4i0Kc0.jpg?auto=webp&s=bbc7ce94a0920ef3ec72d02f2f0a3219d97ddf21)
What is this black round thing on the roof of this transit company van? It was spinning fast. : r/whatisthisthing
These “spinning things” are called Turbine Vents (AKA whirly birds). They are effective at venting hot attic air. They are usually used when there is no... | By RBJ Roofing | Facebook
![ULTRAFLOW Low Profile Spinning Van Roof Vent Air Extractor Ventilator WHITE [AVTWHITEVENTLOW] - £44.99 Inc. VAT : AVT Commercial Vehicle Lighting Products - Flashing Beacons, LED Lightbars Van Roof Vents, Commercial Vehicle Products ULTRAFLOW Low Profile Spinning Van Roof Vent Air Extractor Ventilator WHITE [AVTWHITEVENTLOW] - £44.99 Inc. VAT : AVT Commercial Vehicle Lighting Products - Flashing Beacons, LED Lightbars Van Roof Vents, Commercial Vehicle Products](https://www.vehiclelighting.co.uk/images/lowwk.jpg)