China bladeless fan : comment on quality & blowing strength & noise level

https://wholesaler.alibaba.com/product-detail/bladeless-fan_60293379192.html?spm=a2700.7782932.1998701000.1.IKa5L8

https://www.aliexpress.com/item/New-Design-Bladeless-fan-Electrical-No-Blade-Fan-Home-Appliance-electric-fan-cooling-only-AC220V/32706039409.html?spm=2114.40010208.4.9.ioIn4a

I'm contemplating Dyson's alternatives & looking at the above 2 items.

Q1:
For the top item, it says Supply Air Rate is 30L/S  while output is 450L/S (I presume L/s
means litres/sec) : how is it possible that input is not equal output ?  From physics
point of view, they should be the same, isn't it

Q2:
are the 2 items above the same item?  Bottom item did not indicate the measurement
/diameter of the fan

Q3:
Any tried them before & can comment on these bladeless fan's quality (breakdowns,
noise level ie should be quiet enough not to disturb sleep at night & the air flow could
reach say 4 meters away at top speed?)
sunhuxAsked:
Who is Participating?
 
andyalderCommented:
A1: Presumably 30L/s air is pumped into the ring and shoots out of the circular blade. This airflow pulls surrounding air along with it which creates a vacuum in the middle of the ring that pulls more air through the open ring. So 420L/s is drawn from the back to the front by the 30L/s that gets pumped through the ring. (I don't know if L/s is litres per second either but that's the principle behind a bladeless fan whatever the units, It's similar to the venturi blower except that uses compressed air at a higher pressure. In the drawing at http://www.ciecompany.com/venturi_air_blowers.htm the 420L/s is represented by the 3 arrows going through the back of the device.

I cn't help on Q2 and Q3.
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sunhuxAuthor Commented:
Thanks Andy.

Found a similar looking fan in amazon: many bad comments about it esp
the breakdowns, DoA & the noise level :
https://www.amazon.com/Bladeless-Fan-Adjustable-Multispeed-Mountable/dp/B008CVETUQ/ref=pd_rhf_yaod_p_img_7?_encoding=UTF8&psc=1&refRID=GZ7JZ0T9Z7XBZ6Z1D1M0#customerReviews

Probably I go with Lasco bladeless fan : tho it can't mount on wall, I probably can do a shelf to
let Lasko stand on it
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sunhuxAuthor Commented:
One last question:

For US-based electronics which use 110V, there are adaptors to use them in UK's 220V.
I got one such adaptor & the adaptor get so heated up (boiling water's point) ; is this
an adaptor issue or the electronic device issue?  Worried it will damage the device or
adaptor may explode

Would getting better quality adaptors help?
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andyalderCommented:
I wouldnt trust an adapter, a transformer would be better but a lot biggerand more expensive.
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