Well, I don't know what sort of evils I did in a past life. Or maybe my karma bag was just somehow woefully underfunded. But my ability to laugh at my predicament took a serious sledgehammer blow this afternoon after FedEx showed up and I raced over to the truck repair shop only to discover this......
One of these things is not like the other.
In any case, it's not a Dayton fan, it is an American Cooling Systems fan. Both have 12 blades. My fan is 32" in diameter. The one I received is 36" in diameter. And this was discovered 20 minutes after the overnight Fedex truck left Miami to deliver things to happy people tomorrow. Unfortunately I will not be one of them.
It looks like one could swap blades between them. They are so nearly identical, other than size, that you could probably spin the new one and cut the blades with a hot knife to end up with the small one. I definitely don't want to swap the blades though as one of the old ones does have a crack in the tip.
Morgan spoke with Mike Ellison, who doesn't remember any Series 60's that didn't have this 36" fan. Apparently I'm the oddball. Or 540 is. Or both of us.
Two more days in Santa Rosa.
Unfortunately, there's nothing on either fan that would definitively be a part number. There's a sticker on the new fan that reads 102400. At first I thought that was an ACS part number based on some part numbers I found online. But I can't find anything where 102400 comes up. I might try calling ACS in the morning to see if they can figure out what it is. There's a certain OCD part of me that still wants to find out the OEM part number. Of course now I want it for both the 32" and 36".