There is a piece of insulation inside the boot duct on the grill. Systems were ran without filter in one of them. And the other filter on the other unit was completely plugged drywall dust and dirt .Recommend both systems be thoroughly cleaned. Cleaning evaporator coil in place, pulling and cleaning blower assembly and duct work. Scaffolding will have to be brought in to be able to reach living room vents. Removed filter in the one unit and put downstairs up against the stairs. The other one is still in the attic where someone left it. One is a 20 x 25 x 4 and the other one is a 20 x 25 x 1
