Photo 1 of Fits 24x24 Steel T-Bar Drop Ceiling Grid | 2x2 Feet Lay in Steel Air Supply Diffuser with Round 12" [Neck Size] by Handua | 3 Cone | Drop Celing Vent | White | Outer Dimension: 23-3/4" x 23-3/4"

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Photo 1 of Fits 24x24 Steel T-Bar Drop Ceiling Grid | 2x2 Feet Lay in Steel Air Supply Diffuser with Round 12" [Neck Size] by Handua | 3 Cone | Drop Celing Vent | White | Outer Dimension: 23-3/4" x 23-3/4"Photo 2 of Fits 24x24 Steel T-Bar Drop Ceiling Grid | 2x2 Feet Lay in Steel Air Supply Diffuser with Round 12" [Neck Size] by Handua | 3 Cone | Drop Celing Vent | White | Outer Dimension: 23-3/4" x 23-3/4"