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Questions regarding airflow noise.


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Hello, i am currently doing a small 2 plant wardrobe grow 420 Magazine ®

I am using a 720 m3/h extractor fan that is only running at full speed when the temps occasionally get on the high side. I vent it directly outside and it's quite loud! is there any way i can lower this noise? I know to use insulated ducting and hanging the extractor fan on bungee cords ect.. that's not the problem it is simply the air gushing out the vent at high speeds. I can't think of any way of solving this without restricting airflow?

Does anyone know how these work? 10 H-G Extractor Fan Silencer 250mm x 600mm

Thanks in advance for any help i get with this.
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