Dyson calls it an "air multiplier", but everywhere you see this, it's called a bladeless fan. A fan with no blades? Where does the air come from? Apparently, it's drawn into the bottom of the gadget, where there is a, yes, a conventional fan with blades (just well hidden). The air is fed up to the big loopy round part (for want of a more descriptive name). Somehow, this process also draws in more air from behind the fan and around the edges of the fan. Which gives you lots of air blowing.
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Dyson (the... READ ON