Originally Posted By: ZeeOSix
Originally Posted By: UncleDave
Originally Posted By: ZeeOSix
Originally Posted By: UncleDave
Yeah I read the asterisk - The XG7317 in the box isn't one of those.
- and that says nothing about 99% efficiency in that line - you know this.
There needs to be a formula on that line - like it used to be on the website.
UD
Fram always has used the asterisk, then you go find the line below with the asterisk for the details ... even on their website. "Formula on that line" ... say what?
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Maybe - but its meaningless without the other rating- and the asterisk below refers to a different filter.
99% efficient @< 20 microns (or similar) is what I want to see associated with my filter the one I bought not the other 3.
How the website used to label it (I think that was it ? )
There is nothing on the box referencing my filter model at all. The incomplete spec references3 other models.
UD
You're misunderstanding it. The asterisk line is saying what filter models they used during the ISO test. That's very common among filter companies. At least Fram uses 3 different filter models of different sizes to measure the overall efficiency. Some companies just reference one filter that is the largest sized filter they make.
And it's always been xx% for particles >20 microns (greater than 20 microns) ... which if you've ever seen the multiple discussions about that, it essentially means @20 microns and larger.
And, this has never been clearly explained why they use ">20 microns" ... but after studying the ISO 4548-12 test procedure quite a bit it's because that's the way ISO 4548-12 wants the data reported. See below how they use > for all the particle sizes measured during the test.
I understand it fine.
They didn't use my filter in the test and there are three that meet the spec- the one in the box must not be one of those or it would be on the box.
They used to be clear - now its marketing speak.
They dont use the formula 99@ efficient @ < 20 microns(or similar) in one line anywhere anymore. There are parts and pieces of numbers and formulas everywhere but not together - and not referencing my filter.
Websites changed as have the boxes.
The box says 3 filters meet the spec all completely different part number some look like a different line up entirely but I have no way of knowing unless I start cross referencing what they say meet spec against what Im actually buying. - none of them the one I bought.
It may be as efficiency as the old one - they just dont state that clearly anywhere anymore- I hope so as I use these filter.
UD