16" X 8" 3-Way Air Supply Grille – Steel HVAC Vent Cover with Damper, Wall/Ceiling Register, White Material_Steel + Product Details Size –

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

this model allows for mounting without removing the thermostat

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

These are specially sized to fit into all drop ceilings

16" X 8" 3-Way Air Supply Grille – Steel HVAC Vent Cover with Damper, Wall/Ceiling Register, White Material_Steel + Product Details Size –+ Product Details Outer dimensions: 17. 75"W x 9. 75"H fits a 16" X 8" 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