6x6 White Aluminum Modern Air Return Grille with Washable Filter (Duct Opening) Steel Wall & Ceiling Supply Register:

Wall & Ceiling Supply Register: Designed for sidewall and ceiling supply air use only

2-way airflow design — dual-deflector surface spreads conditioned air in both directions simultaneously

If it is approximately 10" × 4"

It also prevents small objects from falling into the duct below

Duct opening size: 8" × 6" (this is what you measure)

6x6 White Aluminum Modern Air Return Grille with Washable Filter (Duct Opening) Steel Wall & Ceiling Supply Register:CHECK SIZE BEFORE PURCHASE: Fits a 6" 6" duct opening (measure the hole, not the old cover). Please check the Sizing Guide below for overall dimensions. Drop in return air replacement for any 6" 6" duct opening no remodeling required. Washable mesh pre filter included helps catch dust, pet hair, and debris before they enter the return duct. Solid alloy aluminum frame rust resistant, dent resistant, and zero plastic parts. Wall and ceiling compatible