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ENERGY STAR® Certified Variable Speed ECO Exhaust Fans -
Amazon.com: iPower HIFANXEXHAUST12CTB 12 Inch Variable Shutter Exhaust Fan with Speed Controller and Power Cord Kit, 1620RPM, 1600 CFM, Silver : Tools & Home Improvement
24 in Blade, Variable Speed, Shutter Mount Exhaust Fan - 23N624|AX24-1V - Grainger
VENTISOL 12 Inch Shutter Exhaust Fan With Variable Speed Controller,1450CFM Wall Mounted Ventilation Fan, Alumunim Blades Automatic Vent Fan For Greenhouses,Shop,Home Attic,Garage Ventilation,Black - Yahoo Shopping
12 Inch Wall Exhaust Fan - Variable Speed Controllable
12 Inch Wall Exhaust Fan - Variable Speed Controllable
iLIVING 18 in. Wall Mounted Shutter Exhaust Fan, Automatic Shutter, with Thermostat and Variable Speed controller, 1736 CFM ILG8SF18V-ST - The Home Depot
Amazon.com: iLiving 12" Shutter Exhaust Fan with Wireless Smart Remote Controlled Thermostat and Humidity, Variable Speed Wall Mounted Attic Vent Fan, Chicken Coop Ventilation, 960 CFM, 1400 SQF Coverage Area : Tools
Amazon.com: iLiving 10" Wall Mounted Shutter Exhaust Fan, Automatic Shutter, with Thermostat and Variable Speed controller, 65W, 820 CFM, 1200 SQF Coverage Area Silver (ILG8SF10V-ST) : Tools & Home Improvement