It's so quiet how do you know it's working ??
1778527
There is a blue light that lets you know it is on plus you can feel air movement if you place your hand in front of the purifier.
1778528
I love these they are real ionizers - none of this paper filter junk. These new ones have a tiny fan to move air thru, the old ones i had didn't yet worked great. The old ones just pulled air thru with no fan and your hand in front could feel it. Easy to clean. Have 3 large metal plates that just wash and dry.
170250
I wish I could help you but mine is very quiet, in fact I remarked to my husband about how quiet it was.Good luck with this problem.
1573492
I just confirmed with hubby that the one were have makes no noise. It is soft. Frankly when we got it I was like "how is this thin thing going to work?" I don't know how but it does.
1346504
It is so quiet you really can't hear it. Don't let that keep you from buying it though. It is an awesome machine.
1945960
How do you know that it is in fact working - what are the signs/proof that it is working?
2071793
Hi Sandy, It's very quiet. If it wasn't for the lights telling me its done I won't know.
1356362
It is quiet. Just a quiet low hum so you could have it under your desk and would probably hardly hear it.
527617
It doesn't make any noise and mine doesn't even have a light. It works though, I leave my work boots on over night and they are warm the next morning without stinking.
2209525
It is very quiet. It runs all night while we sleep. Sometimes we have to go over to the machine and check to see if is still on. Even if you should happen to hear the unit, it is a "white noise" that will help you sleep.
837242
No light, there is a fan... but there is no noise, I actually have trouble knowing if it is running.
1770337
No, this machine is whisper quiet. You'll be surprised at how little noise it makes.
1092968
It is not silent. It makes a noticeable fluttering sound as it operates. But it does work well.
895352
I consider it very quiet, but there is a faint humming sound. I don't think you can get one that is silent.
1883392
silent....I have to look at the indicator light to be sure it is on unless I am close enough to feel the heat radiating from it.
821040
Mine is silent. Except for watching the rotating blades you don't even know it's running.
295227
It's very quiet. If it's cranked slowly it should be nearly silent. It won't bother anyone.
121819
Mine is completely silent. The only way I know it is operating is to look at the small light in front and watch the time machine icon indicate a backup is underway. If yours is making "noticeable noise" then perhaps it is defective.