16" X 16" Aluminum Insulated Fire Resistant Access Panel Door For Wall / Ceiling Application (Lock and Key) With Frame - [Outer Dimensions: 17" Width X 17" Height] 12" Round Duct Pipe Actual Filter Size – 24

Actual Filter Size – 24 3/4"w x 25 3/4" x 1"

+ Product Details Perfect Fit & Easy Sizing - Designed for a 36" x 16" OR 16" x 36" duct opening (measured at the opening)

+ Product Details Size - 8"w X 8"h Is The Size For The Duct Opening Only

+ Product Details Size - 6"w X 24"h X 2"d (for duct opening measurement only)

this 4-way air vent diffuser allows you to precisely control airflow

16" X 16" Aluminum Insulated Fire Resistant Access Panel Door For Wall / Ceiling Application (Lock and Key) With Frame - [Outer Dimensions: 17" Width X 17" Height] 12" Round Duct Pipe Actual Filter Size – 24+ Product Details Size 16" X 16" is the size for the drywall opening measurement only, actual front end outer dimensions are 17" width X 17" 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.