No replies yet....and I guess I might be telling you something you already know.
I'd call the company directly. I believe they have two factories in Nebraska and a few other numbers that they outsource, usually from China. There used to be a factory rep on this site who would post, but that was years ago. Other than that, they are pretty big in my area for the farm market.
Getting in touch with them is your best bet. In my experience they are very forthcoming with info. I received screen shots of their spec page from their information system. I opened a couple and found them to be a very solid construction, media maybe a bit thinner than Wix. Efficiency isn't terrible but does not seem to be listed the same as others.
B43-S
Established Micron Rating - 18
Beta - 2/75=18/40
Average Efficiency - 74.65%
Wix cross (51040)
Nominal Micron Rating - 21
Beta - 2/60=6/20
Some think the new Wix info is generic, the old beta for the 51040 is 2/20=15/31
Looking at the B134 it appears not to have an ADBV, if that jives with the factory filter you should be good to go. I don't think that the Baldwin will hurt you at all.
