10" X 10" Sound Rated Steel Access Panel Felt Covered Door For Concealed Wall / Ceiling Flush Application With Slotted Lock - [Outer Dimensions: 11" Width X 11" Height] Galvanized Steel + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 18" x 36" OR 36" x 18" duct opening (measured at the opening)

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+ Product Description Enhance your HVAC system's efficiency and your home's aesthetics with our premium aluminum air vent diffuser

with actual outer dimensions of 32

10" X 10" Sound Rated Steel Access Panel Felt Covered Door For Concealed Wall / Ceiling Flush Application With Slotted Lock - [Outer Dimensions: 11" Width X 11" Height] Galvanized Steel + Product Details Perfect Fit+ Product Details Size 10" X 10" is the size for the drywall opening measurement only, actual front end outer dimensions are 11" Width X 11" 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.