10" X 4" 2-Way Air Supply Grille – Steel HVAC Vent Cover with Damper, Wall/Ceiling Register, White Width_20in if your hole is 20"

if your hole is 20" wide by 14" tall

+ Product Details Size - 26"w X 18"h is the size for the duct opening measurement only

6" width X 15

+ Product Details Perfect Fit & Easy Sizing - Designed for a 14" x 24" OR 24" X 14" duct opening (measured at the opening)

actual front end outer dimensions are 16" width X 8" height

10" X 4" 2-Way Air Supply Grille – Steel HVAC Vent Cover with Damper, Wall/Ceiling Register, White Width_20in if your hole is 20"+ Product Details Outer dimensions: 11. 75"W x 5. 75"H fits a 10" X 4" duct opening Durable stamped steel construction ensures long lasting performance Designed for sidewall and ceiling installation with included screws Multi shutter damper with easy lever for precise airflow control Smooth powder coated white finish for a sleek look and scratch resistance + Product Description Maximize your homes airflow with this premium Air Supply Grille air supply