High Frequency EMF Shielding Window film RDF72-Premium Width 2.49 Feet Length 3 Feet Width: 76 cm. Length:3 feet, Material thickness: 75 m. Attenuation 32 dB(99.94 % shielding effectiveness) at 1 GHz. ; Light transmission: 72 %. Indoor application, predominantly on glass surfaces but also on doors and other level surfaces. The film contains the 12 metal layers. Therefore, the edge of the film needs to be sealed. FKV50 Edge Sealant can be used for sealing the edges.