Formulated for high heat and humidity conditions in uncontrolled environments, black Quadrafoam II can withstand harsh environments. Filter frames can include special metal finishes for corrosion protection when exposed to moisture and harmful elements typically found in outdoor atmosphere. RoHS-compliant media also meets standards and classifications such as UL 94 HF-1, UL 900 Class 2, CE, Telcordia NEBS GR-78-CORE, GR-63-CORE, GR-487-CORE, and FMVSS 302.