In case you are interested...

It is a mechatronics brand A/C fan, 120mm square. It has model number UF12A12 and is a 12/14V unit. However my particular version has a code of BTHN and the N gives it some type of IP55 rated splash resistance.

There are a lot of variations of this fan and you have to make sure it has the same wiring setup as the one you are replacing to avoid a custom rewire job.

I can find a BTHNSR version online that also says it has the IP55 rating so maybe that is a new part number that replaces the old BTHN. Maybe our elevator guru on the forum would know the answer. I'm guessing the SR now might mean splash resistant?

I see tons of the BTH and BWH version on ebay which appear to be for indoor applications of the same fan with the same specs?