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As a newbe I just want to say The information you have provided me so far is priceless, on the other side I like that you all can shovel out the BS too. I had a moment to look at a few of your

Its OK Lucky you can say it, I'm full of shit. LOL [felder-woodworking] <felder-woodworking@...> wrote:

Wow John. Pure entertainment huh? At least 90% of the time? I didn't know you were so knowledgeable. ? Warm regards, Lucky

For some strange reason, elected officials just entered my mind, but I’ll refrain from going any further on that topic. :-) David Best

Awe David say it ain't so. Companies aren't manipulating numbers to sell products. That's almost as bad as bean counters and marketing departments running a company.? JohnJMK Services

Like I said - just like dust collection specifications.

I was being serious, I don't watch, read or listen to the news. 90% is pure bullshit. Those that control the media and the information only give you enough for control and manipulation. But Thanx for

Not sure if you’re being sarcastic or serious, but just in case . . . . http://www.usatoday.com/story/tech/2016/12/01/fake-economy-has-users-engaged-enraged-and-confused/94552980/

Hahaha! Warm regards, David Dr David Luckensmeyer Practice Manager Luckensmeyer Medical Pty Ltd melissaluckensmeyer.com.au <http://www.melissaluckensmeyer.com.au/> and Designer and Woodworker Original

David don't know what your referring to when you say fake news, please enlighten me.? JohnJMK Services

I’m pretty sure this is where the current “Fake News” trend started - around dust collection specs. David Best

Presumably the reason they use mg/m3 is because that's the standard medical exposure metric. For example, OSHA doesn't specify filter size, it specifies the maximum quantity (in mg) of dust that can

I don't see how the micron level of the filter and the mg/m3 are not directly related (not necessarily a linear relationship). Of course they are not the same thing, but changing the micron level of

The only filter that gets 100% is totally plugged. A filter is also at its highest efficiency just before its plugged, Hepa or not. We're splitting a hell of a lot of hairs between 0.1, 0.05, 0.03.

Brian, you’ve hit the nail on the head (as usual). Whether a filter can filter down to a certain size or not is only one half of the story. It’s the percentage efficiency that provides the other

I guess I should have continued my train of thought…. I didn’t see anything enlightening on the Festool group. I think an engineer for these dust collector companies would have to provide more

Yes, I emailed their director (Ben Chan) for international marketing regarding the filtration. I told him that all the cheap or junk dust collectors sold in North America come with 5 micron filter. A

5 micron filter. That's a little sloppy

Brian we were obviously trying to find a correlation between the apples and oranges. I think if you read the Festool link you will see the connection or am I completely missing something.

Are Euro and US HEPA standards the same? There is always a lot of talk about filtration standards but a good quality collector with quality filters will return air that won't kill you. As important,