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Blj Htr Heat Recovery Fresh Air Ventilation System Energy Recovery Core. Anti-Mildew and Antibacterial: Features 99.9% anti-mildew and antibacterial properties for hygiene. Washable Design: Polymer membrane core supports immersion water washing for maintenance. Customizable Dimensions: Total height ranges from 200mm to 600mm with customizable options. OEM and ODM Services: Full customization, OEM, and ODM services are available for clients. Low Resistance Surface: Smooth inner surface design greatly reduces wind resistance.