ᐅ "Shell Package" for Centralized Mechanical Ventilation with Heat Recovery

Hello everyone,

I am currently looking into various centralized residential ventilation systems.
At the moment, I have settled on the Zehnder Comfoair 350.
Does anyone know a good site where I can purchase the necessary accessory package myself and install it according to the plan? I mean ducts, vents, supply, and exhaust air.

So far, I have found little information on this.

Thanks