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] Powder-Coated our grill boasts an impressive

our grill boasts an impressive 96% airflow capacity

actual front end outer dimensions are approximately 16 5/8" width X 26 5/8" height -

Ideal for Walls & Ceilings: Designed for seamless installation in standard 20" X 18" duct openings

Actual Filter Size – 21 3/4"w x 11 3/4" x 1"

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] Powder-Coated our grill boasts an impressive+ 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.