Drop Ceiling HVAC Supply Grille - For T-Bar Lay-In - 2 Coned - 24" x 24" - For 14" Vent Connection - Black w12h12 + Product Details Size -

+ Product Details Size - 20"w X 30"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 14 5/8" width X 26 5/8" height

+ Product Details Size – 32" x 36" or 36" x 32" is the size for the duct opening measurement only

Actual Filter Size – 23 3/4"w x 27 3/4" x 1"

you can attain the diameter of the vent

Drop Ceiling HVAC Supply Grille - For T-Bar Lay-In - 2 Coned - 24" x 24" - For 14" Vent Connection - Black w12h12 + 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 ceiling's, 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.