Drop Ceiling HVAC Supply Grille - For T-Bar Lay-In - 2 Coned - 24" x 24" - For 12" Vent Connection - Black Insulated Line Set + Product Details Size –

+ Product Details Size – 14" x 20" or 20" x 14" is the size for the duct opening measurement only

and squirrels

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

actual front end outer dimensions are approximately 28 5/8" width X 20 5/8" height

Drop Ceiling HVAC Supply Grille - For T-Bar Lay-In - 2 Coned - 24" x 24" - For 12" Vent Connection - Black Insulated Line Set + Product Details Size –Drop Ceiling HVAC Supply Grille For T Bar Lay In 2 Coned 24" x 24" For 6" Vent Connection Black These are specially sized to fit into all drop cielings, 24"x 24", also called T Bar systems. Can be hooked up with our "Butterfly Dampers" for precise airflow control Why HVAC Premium? You may think of grilles and registers as a generic component of the ventilation system in your house. But they are also the most visible representation of you air system.