Accord Ventilation model ABCD2X2 is a gabardine, 24-Inch x, Alpine lift ceiling diffuser with a paddle drop in ceiling. To determine the go down size to order, the size of the plant structure opening -LRB- not the experienced vent itself -RRB-. Each Accord Ventilation product is using secondary school social station materials that provide strength and durability. Accord Ventilation floor registers, grates, and vents in a variety of designs and sizes. Accord Ventilation products are to enhance any home decor. Our Lifetime special Warranty every floor register, vent, grate, and grille manufactured by Accord Ventilation.