16" X 20" or 20" X 16" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 17.75 X 21.75] Powder-Coateded This thoughtful design ensures optimal Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

This thoughtful design ensures optimal air circulation for your HVAC system

+ Product Details Size - 4"w X 18"h is the size for the duct opening measurement only

10" Circular Round Aluminum HVAC Supply Grille Air Diffuser - With Butterfly Damper - Vent Duct Cover

+ Product Details Size & Compatibility – The size of the wall angle register boot is 12" X 4" X 6" and it is compatible with duct 6"

Actual Filter Size – 17 3/4"w x 33 3/4" x 1"

16" X 20" or 20" X 16" Heavy Duty Floor Grille Fixed Blades Air Grille Brown [Outer Dimensions: 17.75 X 21.75] Powder Coateded This thoughtful design ensures optimal Compatible With Duct 7in Applications This sheet metal DDAG A 1212 This thoughtful design ensures optimal air circulation for your HVAC system + Product Details Size 4"w X 18"h is the size for the duct opening measurement only