Age for Janitrol furnace?

I could use a little assistence determining the age for this Janitrol Forced Air furnace. I don’t have any info on Janitrol in my cheat sheets…Thanks in advance !

Model# GMT070-3

Serial# 0111609792

Janitrol is now a Goodman product and uses the same date code (or so my information says)…1st 2 numbers are the year – 2nd 2 are the week.

11th week of 2001.

Thank you Jae. I’ll make note of that. Appreciate your help !