Review on VIVOSUN 8 Inch Noise 🔇 Reduction Silencer for Inline Duct Fan by Joshua Martinez

Works exactly as advertised! Reduces the noise generated by a 6" fan blowing extra air into the second floor space above the garage. I bought 3 silencers and they all work great. It is possible that a fan was returned because it was not in the same packaging. like the others, and one had a small dent at the junction of the flange with the straight part of the muffler, otherwise the soundproofing was not affected.