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Polyester Air Filter Cartridge. Moisture-Proof Cardboard Frame: Prevents deformation, breakages, or distortions for long-term stability. Maximized Filtration Area: V-pleating design increases free filtration area for better efficiency. Secure Media Sealing: Media firmly sealed to frame to prevent air leakage effectively. Durable Diagonal Support: Diagonal paper members hold filter media fixedly and sturdily. Flexible Customization: Custom sizes and specifications available based on 25+ years experience. Free Sample Service: Free samples provided for some products, customizable to requirements.