Unique open cell foam in interlaced distribution is designed for superior sound absorption. It can stop the spread of sound wave and allow air flow through the ducting, perfect for reducing noise from fans and carbon filter systems. Features: * Two 8" flanged ends. * Portable and light weight. * Safe and effective operation. * Easy to install and maintenance free. * High-quality corrosion resistant galvanized sheet construction. * Wave crest polyurethane sponge can offer excellent sound and vibration absorption. * This high-performance sound absorbing foam lining can reduce 50% noise! - If the noise of your fan/blower is 50db, our muffler can reduce it to 25db. * Moisture resistant - great for use in damp environment. * Extended collar and lip for easy duct hook-up. * Air tight sealing tape pasted on the muffler Specification: Flange: 8" Fit for Fans/Blowers: 8" Flange Surface Material: Durable Galvanized Sheet Sound Absorbing Foam: Wave Crest Polyurethane Sponge Fusion Point of Foam: 250 degree centigrade The Influence to Hearing of Different Decibel: Decibel Sense of Hearing 0-20db Very quiet, hardly feel 20-40db Quiet, like soft voice 40-60db General, like common talk indoor 60-70db Noisy, bad for nerve 70-90db Very noisy, nerve cells are damaged 90-100db Noisy intensify, hearing is damaged Package Includes: 1x High-quality 8" Duct Muffler
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