Specification Brand : Dayton BulletPoint : Made in United States BulletPoint1 : Transform any kitchen or bathroom ventilation with ease, thanks to this duct fan Reducers that ensures air circulation in confined space. BulletPoint2 : for professional, this product simplifies process of connecting exhaust fan to narrower ductwork without compromising performances. BulletPoint3 : from PVC, this Reducers nozzle to 50mm duct fan and comes in various inner diameters 20mm, 25mm, 32mm, and 40mm, ensuring for smaller ducts. BulletPoint4 : Enhances your ventilation systems efficiency with Duct Fan Reducers Nozzle, accessory for airflows management. BulletPoint5 : installation and maintain a streamlined aesthetic in space with duct fan accessory, elevating your cooling systems functionality. Color : 25mm CompatibleDevices : Inverter ControllerType : Button Control CoolingMethod : Air ExternallyAssignedProductIdentifier : 7436828735078 ExternallyAssignedProductIdentifier1 : 0755139764780 ExternallyAssignedProductIdentifier2 : 755139764780 IncludedComponents : 1 X Cooling Fan ItemName : Dayton Fan Shutter 20 1/2 in ItemPackageDimensions_Height : 13 centimeters ItemPackageDimensions_Length : 20 centimeters ItemPackageDimensions_Width : 19 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : industrial-hvac-fans-and-circulators Manufacturer : Dayton Electric Manufacturing Co. Material : Other MaximumRotationalSpeed : 2300 rpm ModelNumber : 1C745 MountingType : Wall Mount NoiseLevel : 55 decibels NumberOfBoxes : 1 NumberOfItems : 1 PartNumber : 1C745 ProductDescription : 23 In.H-W 5.75 In.L Alu Wall Backdraft Dampr, Damper Application Backdraft, For Nominal Duct Diameter Not Applicable, Frame Material Galvanized Steel, Number of Panels 1, Maximum Air Velocity 2500 fpm, Overall Height 23 in, Rough Opening Diameter 20 1/2 in, Rough Opening Shape Square, Fits Fan Diameter 20 in, For Duct Shape Not Applicable, Free Area 2.3 sq ft, Overall Width 23 in, Frame Material Thickness 20 ga, Overall Length 5 3/4 in, Connection Type Not Applicable, Frame Depth 2 1/2 in ProductSiteLaunchDate : 2016-10-04T16:28:00.270Z RecommendedUsesForProduct : Exhausting Style : Modern SupplierDeclaredDgHzRegulation : unknown SupplierDeclaredHasProductIdentifierExemption : 1 UnitCount : 1 UnspscCode : 40101600 Voltage : 230 volts_of_alternating_current Wattage : 41 watts