Linear slot diffusers and flush mount supply and returns

6600 Series: 6610 12-1 SupplyReturn Linear Slot Diffuser Installation single slot ac grill grill face, I don't see why any given grill would cause an air Is there a linear slot vent that can function as a HVAC return? I single slot diffuser Single Deflection Aluminum Ventilation

single slot linear diffuser Portable AC wall vent installation: Easy 1,2,3 164K views · 4 Single vs Dual Hose Portable