34" X 24" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 36 5/8" X 26 5/8"] Compatible With Duct 6in actual front end outer dimensions LO246 Product Details Size 32 Compatible with Duct 4"

actual front end outer dimensions are approximately 28 5/8" width X 12 5/8" height

+ Product Details Size – 12" X 4" is the size for the duct opening (floor/vent hole) measurement only

Actual Filter Size – 21 3/4"w x 27 3/4" x 1"

+ Product Description Secure your thermostat with the heavy-duty Beige Metal Thermostat Guard

34" X 24" Steel Return Air Filter Grille for 1" Filter Removable Frame [Outer Dimensions: 36 5 8" X 26 5 8"] Compatible With Duct 6in actual front end outer dimensions LO246 Product Details Size 32 Compatible with Duct 4" actual front end outer dimensions are approximately 28 5 8" width X 12 5 8" height + Product Details Size – 12" X 4" is the size for the duct opening (floor vent hole) measurement only