20" X 36" Steel Return Air Filter Grille for 1" Filter - Fixed Hinged - [Outer Dimensions: 22 5/8" X 38 5/8"] Aluminum Design – Fixed hinged for 18" Round Duct Pipe Fixed 45 horizontal blades LO1810

Design – Fixed hinged for easy filter change & cleaning - uses a 1" thick filter

Actual Filter Size – 15 3/4"w x 15 3/4" x 1"

actual front end outer dimensions are approximately 32 5/8" width X 22 5/8" height -

+ Product Spec Sheet Aluminum Return Filter Grille Spec Sheet

+ Product Details Size - 18"w X 12"h is the size for the duct opening measurement only

20" X 36" Steel Return Air Filter Grille for 1" Filter Fixed Hinged [Outer Dimensions: 22 5 8" X 38 5 8"] Aluminum Design – Fixed hinged for 18" Round Duct Pipe Fixed 45 horizontal blades LO1810 Design – Fixed hinged for easy filter change & cleaning uses a 1" thick filter Actual Filter Size – 15 3 4"w x 15 3 4" x 1"