I picked this up and have to say I am pretty impressed with it. My tent is 32x32 so space can get tight and it limits me with certain products but this little muffler actually works to reduce noise significantly! The muffler itself is probably a 4" chamber and it reduces the noise from my tent by 30-40% which blows my mind that such a small space can do that. It is a Phat silent Bob 4" inline fan muffler that uses fiberglass I think for sound deadner and with how small it is I think it does an amazing job of reducing the tent noise and I feel it was money well spent so if you need to reduce grow tent noise I suggest looking at these mufflers as they seem to be a quality product that should last a lifetime.
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