MVHR drone

[JohnMo]

I've had good service from duct store 

[Nick Laslett]

1 hour ago, JohnMo said:

I've had good service from duct store 

 @S2D2, I bought all my spiral ducting form the Duct Store, like @JohnMo.

 

https://www.ductstore.co.uk/acatalog/Attenuators.html
 

They have attenuators. 
 

I used the Lindab Safe Click system, which has rubber gaskets. I bought all these components direct from Lindab. Just find the nearest sales office to you. 
 

https://www.lindab.co.uk/Products/ventilation/Sound-attenuation/?sort=popularity&display=16&page=1

 

They have a huge choice of attenuators. 
 

If you want to be confident that you are going to cut most of the MVHR unit sounds before they hit the manifold, you need an attenuator that is 1000mm long. If you look at the spec sheet for the Lindab Attenuator, the difference between 500mm and 1000mm is significant. 
 

A semi-flexible radial system will also help mitigate the noise. Also, you don’t want your individual ducts going to a supply outlet being too short. 

 

Here is a photo from one of @Nickfromwales installs showing 500mm attenuators, foam insulated ducts and a Ubbink manifold. 
 

Edited October 7 by Nick Laslett

[Nickfromwales]

2 hours ago, Nick Laslett said:

 @S2D2, I bought all my spiral ducting form the Duct Store, like @JohnMo.

 

https://www.ductstore.co.uk/acatalog/Attenuators.html
 

They have attenuators. 
 

I used the Lindab Safe Click system, which has rubber gaskets. I bought all these components direct from Lindab. Just find the nearest sales office to you. 
 

https://www.lindab.co.uk/Products/ventilation/Sound-attenuation/?sort=popularity&display=16&page=1

 

They have a huge choice of attenuators. 
 

If you want to be confident that you are going to cut most of the MVHR unit sounds before they hit the manifold, you need an attenuator that is 1000mm long. If you look at the spec sheet for the Lindab Attenuator, the difference between 500mm and 1000mm is significant. 
 

A semi-flexible radial system will also help mitigate the noise. Also, you don’t want your individual ducts going to a supply outlet being too short. 

 

Here is a photo from one of @Nickfromwales installs showing 500mm attenuators, foam insulated ducts and a Ubbink manifold. 
 

I added a 3rd attenuator to that job, as the client wanted “graveyard in Gravenhill” levels of shhhhh! at night.

 

Then foam duct defo helps out, but I’m now being ‘directed’ towards spiral galv rigid ducting against my will…..

 

I’ll do one and see if it passes muster, if not I’ll be reverting back to foam.