Look inside or around the outside. On the remote chance it fell off and may still be there.
Thank you, I’ve been scanning pic/replacement parts trying to find them.
Did, nothing there.
Cover it with aluminum tape.
Hole cover, snap in plug, bung plug. Whatever gets the point across.
Morning, Terrill. Hope this post finds you well and in good spirits today.
Unfortunately I can not answer your inquiry specifically by name.
Correct me if I am wrong. I take it that is the lower unit for the evaporator coil of an AHU/Air Handler?
Serial & Model numbers help when trying to ‘reference’ replacement parts.
I would search the manufacturer model for replacement parts. Best advice I can offer at this time until someone chimes in with the proper name.
Observation: Missing upper left side Plastic Cabinet Plug on the air handler evaporator plenum.
Recommend: 1: A licensed HVAC contractor install a plenum cabinet plug. 2: Service the HVAC system prior the next heating or cooling season.
Best of luck with your endeavors.