Return Air Grille for and 18" x 18" opening. 21" x 21" overall size. Square design. Black finish. - Majestic Vent Covers
![30" x 8" HVAC Return Air Grille - Plastic Never Rust Vent Duct Cover - for Wall & Ceiling [Outer Dimensions: 32w X 10"h] - - Amazon.com 30" x 8" HVAC Return Air Grille - Plastic Never Rust Vent Duct Cover - for Wall & Ceiling [Outer Dimensions: 32w X 10"h] - - Amazon.com](https://m.media-amazon.com/images/I/81-01eRHgzL.jpg)
30" x 8" HVAC Return Air Grille - Plastic Never Rust Vent Duct Cover - for Wall & Ceiling [Outer Dimensions: 32w X 10"h] - - Amazon.com
![20"x 24" Heavy Duty Solid Cast Aluminum Air Return Grill | Wall Vent Cover | Floor Registers and Grills 20"x 24" Heavy Duty Solid Cast Aluminum Air Return Grill | Wall Vent Cover | Floor Registers and Grills](https://www.floorregistersandgrills.com/wp-content/uploads/2021/12/Cast-Aluminum-Air-Return-Grill-20-x-24_Black.png)
20"x 24" Heavy Duty Solid Cast Aluminum Air Return Grill | Wall Vent Cover | Floor Registers and Grills
![EZ-FLO 16-in x 25-in Steel White Sidewall/Ceiling Return Air Grille in the Grilles department at Lowes.com EZ-FLO 16-in x 25-in Steel White Sidewall/Ceiling Return Air Grille in the Grilles department at Lowes.com](https://mobileimages.lowes.com/productimages/31b52fe4-7cd4-4221-9179-c6ce7f9347a5/17766638.jpg)
EZ-FLO 16-in x 25-in Steel White Sidewall/Ceiling Return Air Grille in the Grilles department at Lowes.com
![10" X 10" Steel Return Air Filter Grille for 1" Filter - Fixed Hinged - Ceiling Recommended - HVAC DUCT COVER - Flat" Stamped Face - White [Outer Dimensions: 12.5 X 11.75] - - Amazon.com 10" X 10" Steel Return Air Filter Grille for 1" Filter - Fixed Hinged - Ceiling Recommended - HVAC DUCT COVER - Flat" Stamped Face - White [Outer Dimensions: 12.5 X 11.75] - - Amazon.com](https://m.media-amazon.com/images/I/81GnGhTHDML._AC_UF894,1000_QL80_.jpg)
10" X 10" Steel Return Air Filter Grille for 1" Filter - Fixed Hinged - Ceiling Recommended - HVAC DUCT COVER - Flat" Stamped Face - White [Outer Dimensions: 12.5 X 11.75] - - Amazon.com
![EZ-FLO 25-in x 20-in Steel White Sidewall/Ceiling Return Air Filter Grille in the Grilles department at Lowes.com EZ-FLO 25-in x 20-in Steel White Sidewall/Ceiling Return Air Filter Grille in the Grilles department at Lowes.com](https://mobileimages.lowes.com/productimages/8633021d-e84a-47a0-aeb2-e16458677d5d/13604906.jpg?size=xl)