Question 1

Stupid question, but is the UV on or off with the button pushed in?  Is something supposed to light up when the UV is on?

Accepted Answer

UV is on when the button is in, off when it's out. When it's on there's a light that's kinda hard to see through the front inside.

Question 2

what is the cfm of air movement, and what range or distance.

Accepted Answer

I do not know the CFM rating on this unit, but I bought 2 others, of supposedly 'better quality' and paid thru the nose for them both (over $400), but this GermGauardian unit out performs both of the others put together. This is the unit to get, if you ask me. I love it! We've had it for over 1 year I think and it is still doing a great job. One of the others absorbs the smells of the room until I turn the unit on, then it distributes the smell out into the room. But the GermGuardian kills the smells. The filter is easily cleaned and durable. I only wish I had invested in another one. Now I'm stuck with these two others, trying to beat the smells in my wife's nursing home room which she must share with a bed-ridden cancer victim. This unit seems to be powerful enough to handle about 12' x 14'. I'd by another one and recommend it to anyone.

Question 3

How is the noise level after a month or two of using it?

Accepted Answer

I noticed it seem loud after about 5 months of years and I followed the directions perfectly cleaning the filter by vacuuming it every three to four weeks. At the 6 or 7th month I noticed I couldn't tell the difference between low medium or high and it seemed loud. I realized I needed to change the filter and when I put a new filter in it got much quieter. So my conclusion is that if your filter is dirty it's going to sound loud and one of the way she'll know besides the noise is that the filter itself will get heavy or heavier than a brand new one. I hope that helps others. For a single 12'x15' bedroom I love this filter.

Question 4

do you have to purchase replacement filters?

Accepted Answer

Yep. Pricey,  BUT  the listed price is for the SET. ( Charcoal odor reducer and TRUE Sub-micron Hepa filter) so together, not as costly as some. I bought this model specifically for the micro-micro Hepa AND the pathogen destroying UV light( Like mold spores)  Some larger machines can have triple the price filters so I'm good with the AC 4100!   I got taken in by the hoopla of a "No filter replacements needed"  model but those don't filter at the level I needed. Stuff seems to slip by the "Electrostatic particle catchers" it seems.

GermGuardian AC4100 3-in-1 HEPA Air Purifier System with UV Sanitizer and Odor Reduction, 11-Inch Table Top Tower

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