Create more comfortable spaces by distributing hot or cold air with Deflectos Round Ceiling Air Diffusers! Easy to install with no studs required thanks to its unique locking feature, this 4" diameter round air diffuser is perfect for drop ceiling applications. Air flow is easily adjusted and each 4" diameter installation is designed to handle areas up to 60 square feet. Deflectos easy to install air diffusers make it easy to add heating/cooling air vents to your room addition, basement, garage and more!