New MVHR install, but have sound issues? Any ideas on a solution?

[lorrianemark]

It seems its extract duct to outside causing most noise. Also discovered it had split in coregated section after solid pipe from unit so have fix that.

[lorrianemark]

Anybody any idea why it's extract duct to outside most noisy.?

[dpmiller]

has the system been correctly commissioned and balanced?

[lorrianemark]

1 hour ago, dpmiller said:

has the system been correctly commissioned and balanced?

Yes It has. Its. Noise at the unit in attic is issue, seems to be noisiest at duct to outside expelling house air. Running at 45% fine, 50%  bit noisy.

 

[Andehh]

We have a MVHR with silencers, can still hear it at 40% or higher. We set it at 15% for background ventilation, 75% boost and just let it do it's thing.

 

When Humidity is higher outside it can sit at higher (30 - 50%) and it is audible but you get used to it eventually.

 

If it becomes a problem, we raise the humidity allowance to 70% or something and it drops itself back down to something very low and inaudible.

[lorrianemark]

Ah it's OK @45% but just wondering why extract to outside duct sounds so much louder? Would dirty filters cause noise. Haven't changed in 10 months.