as by rolling it up for placement in a mailing type tube the assembly includes magnets to secure the assembly to the frame application_number US 69121691 A description referring now to the drawings numeral 10 indicates a screen assembly made in accordance with the invention with particular reference to fig1 and 2a a sheet 12 of screening material such as fiberglass a typical nominal thickness of which is approximately ten one thousandths of an inch ten mils is provided with strips of flexible tape material 14 having an adhesive layer 16 of one or two mils of conventional adhesive such as a contact adhesive placed on a first surface of sheet 12 at an edge thereof and a magnet 18 preferably provided with an adhesive layer 20 of one or two mils of similar adhesive material on its top surface placed on a second opposed surface of sheet 12 the material of tape 14 is selected to have a low tensile strength so the it can be permanently deformed into the interstices of the screening material although most readily available tapes comprise a plastic on which the adhesive is disposed these are unsuitable because they have relatively high tensile strength and do not deform.