24" X 24" Sound Rated Steel Access Panel Felt Covered Door For Concealed Wall / Ceiling Application With Slotted Lock - [Outer Dimensions: 25" Width X 25" Height] Insulated Line Set + Product Details Size -

+ Product Details Size - 26"w X 24"h is the size for the duct opening measurement only

They seamlessly integrate into sheet rock plaster frame ceilings as well

+ Product Description Enhance your ventilation system with our high-quality grilles and registers

+ Product Details Perfect Fit & Easy Sizing - Designed for a 26" x 6" OR 6" x 26" duct opening (measured at the opening)

+ Product Description Maximize your home’s airflow with this premium 2-way air supply grille

24" X 24" Sound Rated Steel Access Panel Felt Covered Door For Concealed Wall / Ceiling Application With Slotted Lock - [Outer Dimensions: 25" Width X 25" Height] Insulated Line Set + Product Details Size -+ Product Details Size 24" X 24" is the size for the drywall opening measurement only, actual front end outer dimensions are 25" Width X 25" Height High Quality High grade steel construction. Design 1mm galvanized steel material with sleek, shiny, durable white powder coat finish for an attractive look & high durability corrosion protection 15mm medium density fibreboard with felt cover and rubber sealing between the door and frame for tight security.