Periscope Vent Duct for Basement?

[Conor]

I want to locate our basement MVHR in the plant room - I'd have to have the vent ducts go through the basement wall and up though the ground - only a couple hundred mm though. I'd then need them to vent another few hundred mm above the FGL. The connection at the wall would need to be tanked.

 

Is there a kit available for this? I was thinking 200mm PVC pipe through the wall, tanked then up through the ground and change to stainless steel clamped to the wall - bit like a boiler flue - then a cowl.

 

Any other ideas. It's also not a problem to build a false wall against the building as I'm having to create a "cavity" here for the electric meter box anyway.

 

Ducts would be in middle of this wall where the cone is... FGL not yet determined yet but assume it's at top of tanking.