An electromagnetic shield comprising two portions in which the first portion consists of a magnetically permeable mat with a conductive sheet bonded to one side and an insulating sheet bonded to the opposite side. In a typical application, this first portion is positioned with the insulating sheet making contact to the underside of a printed circuit board. The second portion consists of a magnetically permeable mat with a conductive sheet bonded to each side. The mat is porous and one of the conductive sheets contains a plurality of openings to permit cooling air which is forced through the pores of the mat to pass through these openings. The conductive sheet containing the plurality of openings is positioned adjacent the components on the upper side of a printed circuit board to provide cooling as well as closely positioned shielding.
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