Who makes Grand Aire?

Who makes Grand Aire and how do I determine the manufacture date?

I went to Google and this is what I got http://www.grandaireac.com/

Roy Cooke

Thank you Roy, I should have thought to do that myself. Wasn’t thinking. Unfortunately, they don’t offer any help.

Grand Aire is manufactured specifically for Baker, now a wholly owned subsidiary of Watsco. Haven’t a clue how they do their date coding.