What happens if there is no wind? Do they still work?

roof ventilator operating

Even on a still day, the unique design will help the Twista to spin with ease.

Hot air rising creates an upward draft therefore activating the Twista to spin and remove heat before it builds up in the roof cavity.

This is another example of the Twista Advantage ensures that your roof and home will remain cool in summer and dry in winter - even if there is no wind, without the need for solar powered wiring and batteries, or noisy electric operation.