18" X 6" 3-Way Air Supply Grille – Steel HVAC Vent Cover with Damper, Wall/Ceiling Register, White Compatible with Duct 8" 75"H – fits a 18"

75"H – fits a 18" X 18" duct opening

+ Product Details Operating Temperature From -40°F To +248°F [-40°C To +120°C]

1/2" - 3119 PSI

Actual Filter Size – 27 3/4"w x 9 3/4" x 1"

then you'll need a 14-inch round vent

18" X 6" 3-Way Air Supply Grille – Steel HVAC Vent Cover with Damper, Wall/Ceiling Register, White Compatible with Duct 8" 75"H – fits a 18"+ Product Details Outer dimensions: 19. 75"W x 7. 75"H fits a 18" X 6" 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