Photo 1 of SANYCASA Register Booster Fan for 4" x 10" Register Holes, Quiet Vent Fan Booster with Intelligent Thermostat, Improves Heating Cooling, App Control, 10-Speeds, Manhattan Smart Register Vent, SN

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Photo 1 of SANYCASA Register Booster Fan for 4" x 10" Register Holes, Quiet Vent Fan Booster with Intelligent Thermostat, Improves Heating Cooling, App Control, 10-Speeds, Manhattan Smart Register Vent, SNPhoto 2 of SANYCASA Register Booster Fan for 4" x 10" Register Holes, Quiet Vent Fan Booster with Intelligent Thermostat, Improves Heating Cooling, App Control, 10-Speeds, Manhattan Smart Register Vent, SN