<；P>；PROBLEM TO BE SOLVED: To provide double sheet films permeating light when covered, expressing high temperature retainability when temperature retaining is required, becoming a single form film by removing air when it is not required and capable of being opened and closed by using a conventional opening and closing device, housed in a small size when it is not used and capable of being repeatedly exchanged from air films to a state equal to a single cover and vice versa for a long period of time, and a method for easily using the same. <；P>；SOLUTION: The agricultural films are constituted by arranging a tube duct between two sheets of agricultural films overlapped to be upper and lower with bringing defogging treatment surfaces to be in the same direction, while fixing the tube duct to at least one film surface out of the two sheets of the agricultural films, in addition, bringing peripheral sides of the double overlapped agricultural films to be partly closed by heat fusion or adhesion, and installing opening ports as an inlet and an outlet of air flow into the intermediate area of the two sheets of the agricultural films. <；P>；COPYRIGHT: (C)2009,JPO&INPIT
