CLICK HERE TO SEE OUR GRILLES INSTALLATION VIDEOSoler & Palau VLED-100 Grille for 4" Duct with LED BulbFeatures:• Longer duct collar for 4" duct• Extendable hanger bars up to 24"• 7.5" grill• Built-in backdraft damper• Uses PAR30 LED bulb (included), built to last a minimum of 60,000 hours• Bulb is not dimmable• Dimensions - 5.25" H X 7" W