20"w X 20"h Extruded Aluminum Adjustable Core Mount Supply Ceiling HVAC Air Grille – Interchangeable: 1-Way, 2-Way, 3-Way or 4-Way - Vent Duct Cover [Outer Dimensions: 21.125" X 21.125"] 12" Diameter actual front end outer dimensions Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

actual front end outer dimensions are approximately 27 5/8" width X 28 5/8" height

+ Product Details Size – 30"w X 10"h is the size for the duct opening measurement only

look no further than HVAC Premium

Lock and Key included

Actual Filter Size – 9 3/4"w x 7 3/4" x 1"

20"w X 20"h Extruded Aluminum Adjustable Core Mount Supply Ceiling HVAC Air Grille – Interchangeable: 1 Way, 2 Way, 3 Way or 4 Way Vent Duct Cover [Outer Dimensions: 21.125" X 21.125"] 12" Diameter actual front end outer dimensions Compatible With Duct 7in Applications This sheet metal DDAG A 1212 actual front end outer dimensions are approximately 27 5 8" width X 28 5 8" height + Product Details Size – 30"w X 10"h is the size for the duct opening measurement only