Return Air Grill,30×12 Return Air Grille [Duct Opening Size] Steel Return Vent Cover, [Removable Door] for 1-inch Filters,Return Air Grille for Side wall 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.If the hole on the wall is 30"(W)x12"(H) please order 30"x12" size option. Actual front end outer dimensions are 31.75" width X 13.75" height.Be sure to measure the wall hole (space) before ordering.Do not measure your old grille. ?Installation - Hinged Door Mechanism,This is not a flat, stamped grille.It features a hinged door that swings open to allow for filter changes. Please ensure this mechanism is compatible with your installation space and needs. Specification: -1/2" spaced fins set at 40 degrees. ownward or upward angled airflow (depending on your installation orientation) -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 * Return Vent Cover 30 "X 12" 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 30" wide by 12" tall, order a 30"x12".If your hole is 14" wide by 20" tall, order a 14"x20". Note: 1.Please allow 0-0.39 in error due to manual measurement.Please make sure you do not mind before you bid.