6" x 6" Removable Duct Door for Fibreglass Ducts - Acudor 6" x 6" Removeable Duct Door for Fibreglass Ducts - Acudor Access Panels for Fiberglass Ducts are designed to provide convenient, economical access to fiberglass ducts. These doors are for use in low to medium pressure fiberglass ducts. Duct access... Compare