Return Air Vent Cover,18x18 Return Air Grill,Steel Return Air Filter Grille [Fixed Hinged] for 1-inch Filters,Return Air Grilles for Sidewall And Ceiling Features: ?Return Air Filter Grille - Crafted from high quality steel with sturdy powder paint coated, this cold air return grill ensures robustness and long-lasting performance. Advanced technology and strict quality control ensure that the products have premium quality and longer service life. ?How To Measure - Always measure the wall opening to determine which size you should order. Wall Opening Size = Listed Size.18"Width x18"Height is the listed size for the hole in the wall only (Duct opening size), Actual front and outer dimensions are 19.75" Width x 19.75" Height.Be sure to measure the wall hole (space) before ordering. if wall hole size (Duct opening size) : 18 "x18", please order. ? Return Air Grille - Enhance the aesthetic of your living space with our steel air return grill, adding a touch of modern elegance to any room. This return air filter grille offers a sturdy and reliable solution for enhancing the air circulation in your home or office. The door/face is removable for easy filter change and cleaning. Specification: -Material: Heavy Duty All-steel construction.Sturdy white powder coated. -1/2" spaced fins set at 40 degrees. Effectively conceals filter. -Use standard 1" thick disposable filters (Filter Not Included) -Fixed Hinged door.Safer and better for ceiling applications. -Equipped with adjustable filter retainers. -Primary use: Side wall and ceiling. -Screws are included with the system, standard. -Concealed mounting holes. Package includes: 1 * 18"W x 18"H Return Air Grille How To Measure A Grille? 1.Measure the air duct/drywall opening, not the register's overall size. 2.DO NOT MEASURE the overall size of the register itself 3.Only MEASURE the "HOLE" in the wall/duct. Every grille has a front end frame, that will overlap at wall joint. · Width vs Height Example: If your hole is 18" wide by 18" tall, order a 18"x18". If your hole is 14" wide by 20" tall, order a 14"x20". Note: 1.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid.