The 2003 Series is a 2 x 2 ft T-BAR 2 Cone Step Down Diffuser. The "cone" shape of the diffuser allows for a maximum volume of airflow into the air-conditioned space.
TRUaire Step-Down Supply Diffuser, 2-Cone, Series: 2003, 24 in W x 24 in L, Square Diffuser Shape, 4-Way Diffusion Pattern, White, Steel, Powder Coated