Drop Ceiling HVAC Supply Grille - For T-Bar Lay-In - 3 Coned - 24" x 24" - For 8" Vent Connection - Black w16h16 actual front end outer dimensions Drop Ceilings / Aluminum The set includes a FG1836 HP-1

actual front end outer dimensions are approximately 10 5/8" width X 26 5/8" height

And is classified as Class 1 Fire Proof - B1

+ Product Details Size - 20"w X 36"h is the size for the duct opening measurement only

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Drop Ceiling HVAC Supply Grille For T Bar Lay In 3 Coned 24" x 24" For 8" Vent Connection Black w16h16 actual front end outer dimensions Drop Ceilings Aluminum The set includes a FG1836 HP 1 actual front end outer dimensions are approximately 10 5 8" width X 26 5 8" height And is classified as Class 1 Fire Proof B1