Drop Ceiling HVAC Supply Grille - For T-Bar Lay-In - 2 Coned - 24" x 24" - For 8" Vent Connection - Black w12h12 + Product Details Size -

+ Product Details Size - 30"w X 28"h is the size for the duct opening measurement only

+ Product Details Size – 12"w X 20"h is the size for the duct opening measurement only

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

Actual Filter Size – 21 3/4"w x 29 3/4" x 1"

actual front end outer dimensions are approximately 18 5/8" width X 20 5/8" height

Drop Ceiling HVAC Supply Grille - For T-Bar Lay-In - 2 Coned - 24" x 24" - For 8" 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 ceilings, 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.