16" X 16" Steel Access Panel Removable Door For Wall / Ceiling Application (Lock and Key) With Frame - [Outer Dimensions: 17" Width X 17" Height] 14" Diameter + Product Details Size - Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

+ Product Details Size - 18"w X 20"h is the size for the duct opening measurement only

+ Product Details Size - 30"w X 6"h X 2"d (for duct opening measurement only)

R6 Fiberglass Back Plenum accepts 6" to 18" Round Spin-in Collars or Start Collars (not included) - Accepts 1" disposable filter (not included) - Recommended Size: 20x20x1

+ Product Details Perfect Fit & Easy Sizing - Designed for a 16" x 28" OR 28" X 16" duct opening (measured at the opening)

75" height

16" X 16" Steel Access Panel Removable Door For Wall Ceiling Application (Lock and Key) With Frame [Outer Dimensions: 17" Width X 17" Height] 14" Diameter + Product Details Size Compatible With Duct 7in Applications This sheet metal DDAG A 1212 + Product Details Size 18"w X 20"h is the size for the duct opening measurement only + Product Details Size 30"w X 6"h X 2"d (for duct opening measurement only)