20" X 16" Steel Return Air Filter Grille for 1" Filter - Removable Frame - * Filter Included * [Outer Dimensions: 22 5/8" X 18 5/8"] w24h24 Tamper-Proof Design – Provides robust

Tamper-Proof Design – Provides robust protection to prevent unauthorized access and ensure consistent thermostat settings

High Quality – High-quality

this solid-base guard ensures long-lasting performance with minimal hassle

Actual Filter Size – 35 3/4"w x 23 3/4" x 1"

Powder-coat finish – smooth

20" X 16" Steel Return Air Filter Grille for 1" Filter - Removable Frame - * Filter Included * [Outer Dimensions: 22 5/8" X 18 5/8"] w24h24 Tamper-Proof Design – Provides robust+ Product Details Size 20"w X 16"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 22 5 8" width X 18 5 8" height Actual Filter Size 19 3 4"w x 15 3 4" x 1" High Quality High quality solid stamped steel with counter sunk screw holes (screws included) and no sharp edges Installation Location Sidewall and ceiling Design Removable door face for easy filter change & cleaning uses a 1" thick filter.