75mm/90mm mixed diameter manifolds

[Sparrowhawk]

I'm looking for distribution box manifolds that I can attach both 90mm and 75mm semi-rigid ducting to. The only ones I've found are Ubbink's which seem to be 75mm with an external converter for 90mm dia ducting. Zehnder's and all those on the BPC site like Quiet-Vent seem to be all 75mm or all 90mm.

 

Any options I've missed?

Edited May 11 by Sparrowhawk

[jayc89]

I'd go for a 90mm distribution box and use 90 -> 75 reducers where you need them.

[Sparrowhawk]

9 minutes ago, jayc89 said:

I'd go for a 90mm distribution box and use 90 -> 75 reducers where you need them.

 

I've been unable to find 90 -> 75mm reducers in any MVHR semi-rigid ducting range. Got a link?

 

Ditto for Y-pieces, which would be handy to ventilate a large cupboard off the room's duct.

[JohnMo]

9 minutes ago, Sparrowhawk said:

unable to find 90 -> 75mm reducers

https://www.epicair.co.uk/products/ae48c-dbox-adaptor

 

Instead of a Y piece use one of these, duct in and the other vent use the second termination point. 

 

https://www.epicair.co.uk/products/ubbink-ae48c-valve-adaptor-90-degree-125mm?pr_prod_strat=jac&pr_rec_id=e37282fe1&pr_rec_pid=4581960974424&pr_ref_pid=4581960417368&pr_seq=uniform

Edited May 11 by JohnMo

[Sparrowhawk]

15 minutes ago, JohnMo said:

https://www.epicair.co.uk/products/ae48c-dbox-adaptor

 

AFAICT this has to be attached direct to Ubbink manifolds (or distribution boxes as they call it) rather than between some 90mm duct and 75mm duct? Will be v pleased if I'm wrong.

 

This was the kind of thing I've been looking for, but as 90 -> 75: https://www.paulheatrecovery.co.uk/product/zehnder-flat-51-straight-converted-to-90mm/

 

15 minutes ago, JohnMo said:

Instead of a Y piece use one of these, duct in and the other vent use the second termination point.

 

Genius John 😁

That reduces the upstairs supply manifold from 8 port to 6 port.

[MikeSharp01]

2 hours ago, Sparrowhawk said:

 

I've been unable to find 90 -> 75mm reducers in any MVHR semi-rigid ducting range

I found that the 75mm fits neatly into the 90mm and the seals work as well. So I have just used tescon tape around the joint to be sure it won't come apart.