RELIABILT Brand, Durability, Quality, Value for Money, Longevity and Trust Factor Actual product outside width 24-in, duct size :21-in, suitable for baseboard opening size 21-in Volume control damper, 180 degress air flow Removable faceplate for easy installation and cleaning Designed to accommodate vent opening in the floor Listed product sizes refer to the duct opening measurements, not the register itself Color/Finish Family: White Manufacturer Color/Finish: White Type: Baseboard diffuser Duct Opening Height (Inches): 2.5 Duct Opening Width (Inches): 21 Duct Size: 2-1/2-in x 21-in Outside Depth (Inches): 2.75 Outside Height (Inches): 4.5 Outside Width (Inches): 24 Weight (lbs.): 2.18 Airflow Direction: 180-degrees Commercial/Residential: Commercial/Residential Design: Louvered Hardware Included: No Installation Location: Baseboard Material: Steel Package Quantity: 1 Paintable/Stainable: Paintable Shape: Trapezoidal Style: Basic Volume Control Damper: Yes Warranty: 2-year limited Wi-Fi Compatibility: No CA Residents: Prop 65 Warning(s): No UNSPSC: 40101500