ROTAIRE 3840 R - 4" HEAT OUTLET VENT W/DAMPER
Along with the best features of the Rotaire Grille, the Rotaire Register incorporates a unique worm-drive damper for increased operational efficiency. Just a quarter turn of the center knob opens or closes the vent wings smoothly. In the fully open position the vent wings are completely retracted allowing 100% unrestricted air-flow.
Size: 5-1/2" Dia.
MFG Part Number: 3840RGS