Drop Ceiling HVAC Supply Grille - For T-Bar Lay-In - 3 Coned - 24" x 24" - For 8" Vent Connection - Black w22h22 + Product Details Size –

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

Actual Filter Size – 27 3/4"w x 33 3/4" x 1"

Performance – High diffusion induction rates result in rapid temperature and velocity equalization of the mixed air mass well above the zone of occupancy

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+ Product Details Size - 30"w X 24"h is the size for the duct opening measurement only

Drop Ceiling HVAC Supply Grille - For T-Bar Lay-In - 3 Coned - 24" x 24" - For 8" Vent Connection - Black w22h22 + Product Details Size –Easy Unrestricted Air Flow For Your HVAC System See our separate listing for Butterfly Dmaper to Control Airflow Optional Butterfly Damper Available At Asin: B007CNEL1W For 8" Round Duct Opening Spiral or Flex Q: Why BLACK? A: Black Grilles Always Look Sharp And Never Show DIrt & Dust Marks Drop Ceiling HVAC Supply Grille For T Bar Lay In 3 Coned 24" x 24" For 8" Vent Connection Black These are specially sized to fit into all drop ceilings, 24"x 24",