SIZE - SIZE 1 = (10" x 6" Overall Dimensions) - MEASURING INSTRUCTIONS - Measure the overall dimensions of your existing vent/ register. The overall dimensions of a SIZE 1 will be 10"x6" CLASSIC DESIGN – Instantly improve the look of your existing ugly registers. NO TOOLS REQUIRED – the Magnetic Frame allows you to connect to your existing register in seconds (retrofit kit included for aluminum registers) PAINTABLE – Paint to match any room UNIVERSAL DESIGN includes cutout for existing louver handle HIGH QUALITY – Electrostatic Filter (Included) Crown Vent Register Cover & Filter - SIZE 1 (Overall 10"x6") Designed to fit over your existing HVAC register / grille with an integrated magnetic frame, replaceable electrostatic media filter, NO TOOLS REQUIRED.