20" X 20" Sound Rated Steel Access Panel Felt Covered Door For Concealed Wall / Ceiling Application With Slotted Lock - [Outer Dimensions: 21" Width X 21" Height] rg1010 + Product Details Size -

+ Product Details Size - 4"w X 18"h is the size for the duct opening measurement only

+ Product Details Size – 8"w X 34"h is the size for the duct opening measurement only

Solid Rigid Steel Body For Durability and Reliability

+ Product Details Size - 26"w X 8"h is the size for the duct opening measurement only

+ Product Details Size – 10" x 14" or 14" x 10" is the size for the duct opening measurement only

20" X 20" Sound Rated Steel Access Panel Felt Covered Door For Concealed Wall / Ceiling Application With Slotted Lock - [Outer Dimensions: 21" Width X 21" Height] rg1010 + Product Details Size -+ Product Details Size 20" X 20" is the size for the drywall opening measurement only, actual front end outer dimensions are 21" Width X 21" 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.