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I had good result with True North seed.

I did not returned it, I am using in my Veg. tent/Drying tent that way I can control the amount of ventilation for drynig buds and use it at low speed witch has less noise, but I am not happy with the purchase.

I was saying very loud at 100% and ventilation eficiency at 50-70% compared to the Vivosun fan, but the reviews online are very good ?.

I had the same issue with my ac infinty t4 fan, same setup vivosun 4 in exhaust fan, the indinity was very loud at 10%