Size:6" Features: Two flanged ends Safe and effective operation The thickness of sound absorbing foam has been upgraded to 3-1/4" (that is more effective than 1-1/2" or 2" in the market) High-quality corrosion resistant galvanized sheet construction Wave crest polyurethane sponge can offer excellent sound and vibration absorption Moisture resistant - great for use in damp environment Extended collar and lip for easy duct hook-up Perfect for reducing noise from fans and carbon filter systems Suggest to use with your ducting(not included) to connect with this muffler and your blower Specifications: 6" Flange Overall Size: 9-1/2" Dia. x 21-1/2" L Fit for Fans/Blowers: 6" 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: 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 Content: 1x Upgraded Duct Muffler W/ Thick Sound Absorbing Foam
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