20" X 20" Aluminum Insulated Fire Resistant Access Panel Door For Wall / Ceiling Application (Lock and Key) With Frame - [Outer Dimensions: 21" Width X 21" Height] RV Mobile Home + Product Details Size –

+ Product Details Size – 12" x 12" is the size for the duct opening measurement only

+ Product Details Size – 26"w X 6"h is the size for the duct opening measurement only

you can attain the diameter of the vent

Actual Filter Size – 31 3/4"w x 21 3/4" x 1"

+ Product Details Size – 25"w X 25"h is the size for the duct opening measurement only

20" X 20" Aluminum Insulated Fire Resistant Access Panel Door For Wall / Ceiling Application (Lock and Key) With Frame - [Outer Dimensions: 21" Width X 21" Height] RV Mobile Home + 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 Strong and sturdy aluminum built to last. Design Aluminum material & color to give your space an attractive look & provide high durability corrosion protection no rust. Built in tumbler lock and key is provided Easy Access Provides easy access for HVAC, plumbing, electrical, crawlspace etc.