12" X 20" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 21.75 X 13.75] Compatible with Duct 10" 75"H – fits a 14" 4" Round Duct Pipe Product Details Size The SHEASC10W1-HP

75"H – fits a 14" X 6" duct opening

+ Product Details Size – The size of 8" straight saddle stick on take-off is 12"/14" and it is compatible with duct 8"

This simple adjustment reduces HVAC strain

+ Product Details Perfect Fit & Easy Sizing - Designed for a 8" x 26" or 26" x 8" duct opening (measured at the opening)

These grilles and registers give you an extra measure of quality that are

12" X 20" Heavy Duty Floor Grille Fixed Blades Air Grille Brown [Outer Dimensions: 21.75 X 13.75] Compatible with Duct 10" 75"H – fits a 14" 4" Round Duct Pipe Product Details Size The SHEASC10W1 HP 75"H – fits a 14" X 6" duct opening + Product Details Size – The size of 8" straight saddle stick on take off is 12" 14" and it is compatible with duct 8"