reading a serial number

Miscellaneous Inspection Topics AskNACHI.org Questions
1

I was reading somewhere about how to read the information on a serial number of an air handler/heat pump unit. but I cannot find it.

2

http://hisearch.org/hvac.aspx
There you go

3

http://hisearch.org/hvac.aspx
There you go

4

Are you saying that some people you have to tell them twice???