21-1/2 Inch x 46-1/4 Inch Laminated Fixed Non-Vented Deck Mounted No Leak Skylight from the FS Collection Product Specifications: SKU: FS C06 2004 Finish: N/A Manufactured By: Velux Depth: 4.5 in. Height: 46.25 in. Maximum Roof Pitch (Degrees): 85 Minimum Roof Pitch (Degrees): 14 Rough Opening Height: 45.75 in. Rough Opening Width: 21 in. Solar Heat Gain Coefficient: 0.26 U-Factor: 0.44 Width: 21.5 in. Low-E: Yes Skylight Glazing: Laminated Skylight Ventilation: Fixed Non-Vented Country Of Origin: USA Energy Star: Yes Made in America: Yes