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

Posted on 2016-11-20
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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?)
0
Question by:sunhux
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LVL 56

Accepted Solution

andyalder earned 2000 total points
ID: 41895038
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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Author Comment

ID: 41895776
Thanks Andy.

the breakdowns, DoA & the noise level :

Probably I go with Lasco bladeless fan : tho it can't mount on wall, I probably can do a shelf to
0

Author Comment

ID: 41895782
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

Would getting better quality adaptors help?
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LVL 56

Assisted Solution

andyalder earned 2000 total points
ID: 41895784
I wouldnt trust an adapter, a transformer would be better but a lot biggerand more expensive.
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