8" x 24" or 24" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 10.5" X 26.5"] 14" Diameter Actual Filter Size – 27 Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

Actual Filter Size – 27 3/4"w x 27 3/4" x 1"

+ Product Details Size - 20"w X 16"h is the size for the duct opening measurement only

+ Product Details Size – 22"w X 34"h is the size for the duct opening measurement only

Looks like it was just waxed

Actual Front End Outer Dimensions Are 12" Width X 4" Height - SEE IN DESCRIPTION HOW TO MEASURE A GRILLE

8" x 24" or 24" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Aluminum White [Outer Dimensions: 10.5" X 26.5"] 14" Diameter Actual Filter Size – 27 Compatible With Duct 7in Applications This sheet metal DDAG A 1212 Actual Filter Size – 27 3 4"w x 27 3 4" x 1" + Product Details Size 20"w X 16"h is the size for the duct opening measurement only