Miller Air Handler age?

Specific Inspection Topics Inspecting HVAC Systems
1

Can someone tell me the age of a Miller air handler, model # B1BM024K-A; S/N# B1B9409-01200

My best guess is Sept. 1994
Information found:http://www.buildingcenter.org/system/files/userfiles/images/MILLER%201%20Serial%20Number.jpg

2

You are correct.
http://www.buildingcenter.org/miller

Nordyne manufactures Miller and a host of other brand names. Your example is one of several serial code styles by Nordyne.
http://www.buildingcenter.org/nordyne