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] Compatible with Duct 8" Actual Filter Size – 29

Actual Filter Size – 29 3/4"w x 15 3/4" x 1"

875" width X 41

What does this mean

+ Product Details Perfect Fit & Easy Sizing - Designed for a 30" x 6" OR 6" x 30" duct opening (measured at the opening)

10"w X 4"h Is The Size For The Duct Opening Measurement Only

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] Compatible with Duct 8" Actual Filter Size – 29+ 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.