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3M OAC100 Operations Manual

Looking for a 3M OAC100 Operations Manual.
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How often should I replace the Replacement Filter 4 1/4 x 10 1/4?

You should replace the Replacement Filter 4 1/4 x 10 1/4 every 3 months.

Jul 15, 2012 | 3M Replacement Filter, 4 1/4 x 10 1/4

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What is the Replacement Filter 4 1/4 x 10 1/4 used against?

The Replacement Filter 4 1/4 x 10 1/4 is used against microscopic and large allergens.

Jul 15, 2012 | 3M Replacement Filter, 4 1/4 x 10 1/4

2 Answers

I have been looking to buy an air purifier and people keep telling me to get a HEPA. What does this mean?

HEPA is a type of air purifier. It stands for high-efficiency particulate air. To qualify as a HEPA filter by government standards the filter must remove 99.7% of all particles larger than 0.3 micrometers from the air. The following site lists the top 10 HEPA purifiers available online -

Jul 12, 2012 | 3M "Replacement Filter, 11 7/8 x 18 3/4"

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My filters turn black after about a week

I am also experiencing this problem, as well as 2 other people that I found on google, so I am inclined to think tha 3M has changed something in their manufacturing process, I think it very odd that this problem is manifesting itself at this time in different locations.
I have been using this product for sometime, and the problem of filters turning very dark did not exist when I started using this product

Jul 02, 2009 | 3M Filtrete Ultra Allergen Air Filter...

1 Answer

Can't reset the filter status lights.

Is it possible you put the filter in backwards?

Mar 10, 2009 | 3M Filtrete FAP02 Air Purifier

1 Answer


I used a can of compressed air to clean my fan blades and this did the job. I bought a 6-pack of 3M Dust Remover at Sams Club to save money. Hope this helps.


Dec 18, 2007 | Kaz Honeywell QuietClean HFD-135 Air...

1 Answer

Can the unit be mounted in a window?

there is no reason why not if the outside part is properly weatherproofed and screened to stop insect etc ingress - easier may be to duct the unit to a hole in a window - use at least 125mm/5inch ducting and dont make it too long. It is not recommended to run the unit in this way, however, as you will almost certainly find that the filters etc will block very quickly due to many more airborne particles(especially living ones) in outside air (depending on your situation) and the fact that inside a room with the unit running you have a relatively closed system that will steadily get cleaner as you use the unit. best way to test this would be to run the unit normally but outside for a while to see if it functions ok. Hope this helps - i cant see that you would gain anything from running the unit in a window apart from higher filter replacement costs :)

Oct 09, 2006 | 3M OAC100 Air Purifier

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