12" x 12" - 1-Way Extruded Aluminum Ceiling Diffuser Square - HVAC Vent Cover 1-Way + Product Details Size – Width_20in These won t hinder RFG1620 FBA

+ Product Details Size – 25"w X 10"h is the size for the duct opening measurement only

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

actual front end outer dimensions are approximately 18 5/8" width X 24 5/8" height

75"H – fits a 14" X 8" duct opening

Actual Filter Size – 11 3/4"w x 27 3/4" x 1"

12" x 12" 1 Way Extruded Aluminum Ceiling Diffuser Square HVAC Vent Cover 1 Way + Product Details Size – Width_20in These won t hinder RFG1620 FBA + Product Details Size – 25"w X 10"h is the size for the duct opening measurement only + Product Details Size – 18"w X 12"h is the size for the duct opening measurement only