Are these valves meant to direct air through my ducts? It seems that way when I play with them but I don't notice any difference at the vents.
I have one two vents attached to this line and one of them barely gets any blows any air....even when I close the vents of the other on. I don't see any obstructions so I'm not sure what the problem is.
This duct is on a line form the furnace that splits into two ducts. One goes to the master bedroom on the 2nd floor and that vent blows very strong. The strongest in the house. The other duct is the one pictured here which feeds two vents on the main floor directly above it. Those don't blow too well.
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