rFoil 1800 Ultra NT SCIF Barrier - Perforated, 4' x 125' (500 sq ft)Perforated Ultra NT SCIF Barrier is a specialized RF shielding material designed for secure environments where electronic surveillance must be controlled. Constructed with a tear resistant woven polyethylene core between two reflective aluminum foil surfaces, it blocks unwanted RF signals from entering or escaping a protected space. The perforated design supports necessary airflow, making it suitable for SCIF rooms and other secure areas where vapor