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" 10"w X 4"h Is The

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

Design – Designed to withstand bends and sharp turns without kinking

What does this mean

2 Standards - MERV 8 - And An Average Arrestance Of 90-94%

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

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" 10"w X 4"h Is The+ 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.