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Features:- Easy to install and maintenance free- 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- Suggest to use with your ducting(not included) to connect with this muffler and your blower- Surface material: durable galvanized sheet- Sound absorbing foam: wave crest polyurethane sponge- Fusion point of foam: 250°C- Fit for Fans/Blowers: 8" FlangeSpecifications:- Flange diameter: 8"(20cm)- Overall size(LxDia.): 24"x11"(61x28cm)Package Contents:- 1x Duct Muffler With Thick Sound Absorbing Foam