Air return duct is not connected to the blower intake plenum

[idreos]

I am considering buying a condo and when I first looked at the property I noticed the HVAC system's blower was in a small closet.

Upon closer observation I saw that the air return grill in the living room wall was connected to a duct that was never connected to the blower intake plenum. See photo below.

When I had the property inspected the home inspector also noticed the same situation. The Trane HVAC blower was installed 6 years ago.

Is this a faulty installation?
Thanks for your help

 

[Stuff]

I see a filter in the lower left. The closet becomes the return plenum so still functional as long as it is not a gas furnace with an air intake. What they did may have been to reduce noise in the living room.

 

[Sponsor]

 

[Fitter30]

Look up in that furnace closest see if the ceiling is in. Then their using that as a return air from the second floor.