16" X 16" Sound Rated Steel Access Panel Felt Covered Door For Concealed Wall / Ceiling Application With Slotted Lock - [Outer Dimensions: 17" Width X 17" Height] Line Covers diagonally feed it through the

diagonally feed it through the square hole

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+ Product Details Size - 4"w X 12"h is the size for the duct opening measurement only

Open/close easily with push-lock technology

16" X 16" Sound Rated Steel Access Panel Felt Covered Door For Concealed Wall / Ceiling Application With Slotted Lock - [Outer Dimensions: 17" Width X 17" Height] Line Covers diagonally feed it through the+ Product Details Size 16" X 16" is the size for the drywall opening measurement only, actual front end outer dimensions are 17" Width X 17" 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.