ᐅ Plan the ventilation system before starting the structural shell construction

Hello!

Since I need to install ventilation systems with heat recovery for my new build (semi-detached house with 4 residential units), I am considering which option to choose and what measures I can take during the shell construction phase to ensure the system is implemented optimally and cost-effectively.

A central system seems more complex, as these units require some space and I need one system for each side of the semi-detached house. In addition, planning the rough-in installation is not straightforward. Estimated cost: 2 x 7000€.

A decentralized solution appears simpler. I plan to pre-drill a hole in a 499 x 365 x 249 mm (20 x 14 x 10 inches) aerated concrete block (Ytong) in each living room before the masons start laying the walls (according to DIN 160), to save the effort later on, which definitely won’t be easier or cheaper afterwards. This means 14 holes in total, one in each living room. Cost: 14 x 500€ = 7000€.

What do you think of my plan? Are there any important points I should keep in mind?

Thanks

If you want a good installation, it’s not just about making a hole anywhere. Find out where the "holes" make sense and how to proceed with construction to minimize noise. Otherwise, you might end up living inside a drafty organ pipe like an amateur.

If you don’t have to live in the house yourself, a decentralized system can be used, but even that should be properly planned. Some manufacturers offer this option.

I realize that even with these decentralized systems, the planning and placement are still quite important. First, I will have the walls built, and then drilling holes into the Ytong (aerated concrete) walls with a core drill should not be a problem.

I have 14 living spaces, and with that number, I would be especially careful not to choose a product that might cause problems later on, especially with tenants.

Are there decentralized ventilation systems that are truly trouble-free (quiet) and ideally last a lifetime?

dobbelhaus schrieb:

Are there decentralized ventilation systems that are truly trouble-free (quiet) and ideally last a lifetime?

That’s three contradictions in one sentence. No, such a thing does not exist.

It would be interesting if someone here has already gained experience with this–

According to the documentation, Leaf1 offers heat recovery of up to 91%, MEnV 180 II up to 85% heat recovery.

There seem to be some user reports about Lunos e2 here: https://www.hausbau-forum.de/threads/lunos-e-Erfahrungen-zu-dez-Lüftung-gesucht.10747/page-23#post-250165