16" X 20" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 18 5/8" X 22 5/8"] Color_Red Oak Wood 1/2" White insulation will give CRFG126 Curved Blade Steel hp birdscreen close

1/2" White insulation will give you a good R value of 3

Design – Unrestricted airflow for your HVAC system - adjustable one-way louver with full horizontal airflow directional control - single deflection supply grill with 96% airflow - noise free components - no vibrating louvers etc

actual front end outer dimensions are approximately 3

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

+ Product Details Size – 6" x 14" or 14" x 6" is the size for the duct opening measurement only

16" X 20" Steel Return Air Filter Grille for 1" Filter Removable Frame [Outer Dimensions: 18 5 8" X 22 5 8"] Color_Red Oak Wood 1 2" White insulation will give CRFG126 Curved Blade Steel hp birdscreen close 1 2" White insulation will give you a good R value of 3 Design – Unrestricted airflow for your HVAC system adjustable one way louver with full horizontal airflow directional control single deflection supply grill with 96% airflow noise free components no vibrating louvers etc