Post #4185563

2026-07-21 17:34 UTC

Its true there is a fan in the base of all bladeless fans, but the fan is smaller then traditional fan designs and moves the same if not more air then traditional fans. Air is pulled in through the base and forced through a thin slit. This fast stream of air creates an area of low pressure, drawing in and amplifying surrounding air behind the slits. Because air “sticks” to itself, when you get some air moving (by breathing out, for example), the initial bit of air that you move “drags” some air with it from beside and behind. This is what Dyson calls “air multiplier technology”. Dyson uses this property of air to claim that they only have to move a fraction of air (with the fan in the base) of all the air that blows past you. Here is a example of how this works, and how you can use one breath to fill a large bag. www.youtube.com/watch?v=rAAelB7nN14 Here is a image of the multiplier effect, from the original intake of air at the bottom. You can see the air is multiplied from behind and infront of the fan.

Replies (5)

@hOrni@lemmy.world 2026-07-21 17:49

A traditional fan also pulls air from around its blades using the same principal. A bladeless is just a gimmick it has no actual benefits. Here’s a video on the subject: www.youtube.com/watch?v=ySSo5PmZZJM It turns out, a bladeless fan is even less efficient than a traditional one. It works better, when you remove the casing.

Open ##4185562
@ColeSloth@discuss.tchncs.de 2026-07-22 00:53

It’s also just Dyson’s completely overpriced bullshit. It makes weak air flow and has no real benefit for use as a fan. Project Farm has tested them a couple different times. They’re expensive aesthetic toys. *Edit: While I’m on a bit of a Dyson rant; I’d just like to also say that I HATE their hand dryers that some places bathrooms use.

Open ##4188446
@ChaoticNeutralCzech@feddit.org 2026-07-21 17:45

Fans are usually loud in proportion to their speed. Quiet ceiling fans have a big diameter and many blades. Doesn’t a small fan cause a lot of noise?

Open ##4191844
@ToxicWaste@lemmy.cafe 2026-07-21 17:48

still a miss-labeling to call them bladeless fans, just because the blades are hidden. by that logic my beef raviolis are vegetarian (tbf: the catholic church made a similar claim during the medieval ages). Bernoulli Fan is not only more accurate, it also sounds much cooler.

Open ##4197232
@rethnor@lemmy.zip 2026-07-22 06:05

I’ve never really understood this multiplayer thing, sounds like a free energy gimmick. You can move more mass at the same speed without putting in more power.

Open ##4219657