Drop Ceiling HVAC Supply Grille - For T-Bar Lay-In - 2 Coned - 24" x 24" - For 8" Vent Connection - Black 18" Round Duct Pipe + Product Details Size -

+ Product Details Size - 20"w X 36"h X 2"d (for duct opening measurement only)

Actual Filter Size – 15 3/4"w x 21 3/4" x 1"

Tamper-Proof Design – Provides robust protection to prevent unauthorized access and ensure consistent thermostat settings

+ Product Description Upgrade your HVAC system with our heavy-duty

Drop Ceiling HVAC Supply Grille - For T-Bar Lay-In - 2 Coned - 24" x 24" - For 8" Vent Connection - Black 18" Round Duct Pipe + 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.