Features: 1) Filter media are imported from American HV and Finland Ahlstrom 2) Excellent filter efficiency and great airflow 3) Wide pleat ***cing, great filter surface 4) Electrochemical plate top and bottom, no rust 5) Perforated zinc galvanized metal core, provide reinforcement and good airflow 6) Specialty chlorine rubber gasket to ensure airtight sealing 7) Applicable temperature: 65oC