Originally Posted By: MNL
Originally Posted By: ZeeOSix
Well, a particle that is 20.001 microns is size IS >20 microns.
Member Motorking here says their ">20 microns" statement means @20 microns and larger. So saying "@20 microns" is technically correct also.
In the case of Fram, they state to have a 99% efficiency for particles >20 microns. For you and me, it could mean 20.001 micros.
For Fram, it could mean 40 micros. Even if the filter only catch pebbles and let everything less than 40 microns through, it still fall within the ">20 microns" as advertised. If Fram claims to have a 99% efficiency for everything from 20 microns and bigger, why not use a "equal and greater than" (≥) symbol?
What you said in red just isn't logical or true. This is why - because if everything between 20 and 40 microns went through at less than 99% efficiency, then they couldn't use the "99% efficient for particles >20 microns" specification because every particle between 20.01 and 40 microns is not >40 microns - they are less. Fram could literally get sued for false advertising by other filter manufacturers and anyone else that cares and proved they lied. Easy to do for other filter manufacturers, because all they have to do is buy some Fram Ultra filters and run the ISO tests in their own laboratory to confirm Fram is truthful in there advertised efficiency spec. I highly doubt Fram's legal department is that stupid to put themselves into a false advertising lawsuit.
When Fram says "99% efficient for particles >20 microns" they essentially mean any particle that is greater than 20 microns will be filtered at 99% efficiency, period. That means everything 20.01 microns and above.
And yes, I've asked Motorking a couple of times why they (Fram) don't say "20 microns and above" instead of using the ">20" symbol. I don't think he ever saw my post, as he doesn't hang out here much at all, only pops in now and then.