10" X 10" Steel Flush Access Panel Door for Wall/Ceiling Application with Slotted Lock, Mud-in Flange - [Outer Dimensions: 11" Width X 11" Height] Compatible With Duct 12in + Product Details Size -

+ Product Details Size - 4"w X 20"h is the size for the duct opening measurement only

Actual Filter Size – 31 3/4"w x 5 3/4" x 1"

+ Product Details Size – 10" X 6" is the opening (vent hole) dimension - actual size is approx

and lay it flat in the grid

10" X 10" Steel Flush Access Panel Door for Wall/Ceiling Application with Slotted Lock, Mud-in Flange - [Outer Dimensions: 11" Width X 11" Height] Compatible With Duct 12in + Product Details Size -+ 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. Flush Access Door Is a type of door or panel designed to provide access to concealed spaces, such as HVAC systems, electrical components, plumbing pipes, or other utility areas. Unlike traditional doors that have visible frames and hinges, a flush access door is