This is a 20"x14" return air can, made in America from American made 26 Gauge Steel Galvanized Sheet Metal, and a 20"x14"x1" filter grille included. We will install a round, starting collar 12" in diameter (Please specify size needed). The can is 5" tall with a 5/8 " flange on the open end. We offer free shipping to all 48 of the Continental United States; shipping to Hawaii, Alaska, or International shipping require special shipping costs. We are a complete sheet metal shop .