CertiChute™ Universal 15W″ x 18H″ Stainless Steel Bottom Hinged (BH) Chute T Handled Intake Door is a professional-grade solution. This is a made from a 20 gauge in the front, and heavier duty 18 gauge in the back for strength with premium No. 4 finish stainless steel for maximum durability and a sleek, modern look.