ᐅ Tips and Tricks for Controlled Residential Ventilation Systems

Hello everyone,

Some of you may have already read my other thread about our building project.
https://www.hausbau-forum.de/threads/Projekt-Eigenheim-viele-fragen-wenig-Erfahrung.27222/page-6

Now, I would like to gather tips and knowledge from you all.
We plan to install a mechanical ventilation system with heat recovery.
According to the Helios mechanical ventilation easyPlan tool, we are recommended either a
mechanical ventilation EC 500W ET or
mechanical ventilation EC 370W ET unit.

Exhaust air volume is 236 m³/h (139 cfm) and
supply air volume is 234 m³/h (138 cfm).

Air exchange rate is 0.28.
Nominal ventilation is 235.
Intensive ventilation is 306.

We have an area of 280 m² (with basement and utility spaces) and
a volume of 849.95 m³ (30,000 ft³).

Which suitable devices can you recommend and why?
Is the duct length really 15 m (50 ft)? That could be problematic with my current planning.
We plan to use 75 mm (3 inch) round ducts.

Do you have any questions?

Thanks in advance for your insights and expertise.

Hello,
we have quite similar requirements and installed a Zehnder 350. My supplier had so many problems with Helios that he no longer installs or sells their systems. The Zehnder is said to be one of the quietest units on the market. However, I would always recommend installing a soundproof door in front of the utility room.
The 350 model is fully sufficient for us; the system mostly runs in a reduced mode at about 160-170 m³/h (100-106 cfm) and only runs in normal mode at 220 m³/h (130 cfm) for about 3 hours in the morning.

Tip: try googling "Schliebe" and "ventilation." You will find the person who planned our ventilation system and from whom we also purchased the materials. We installed it ourselves, which was quite straightforward. However, we placed the ventilation ducts on top of the screed. The 75mm (3 inches) round ducts are probably meant to be cast into the concrete ceiling. If you do it yourself, you can quickly run out of time because the ducts have to be installed in the ceiling reinforcement very quickly once the concrete mixer is scheduled for the next day.

In my opinion, sourcing and installing a mechanical ventilation with heat recovery system yourself is one of the areas where you can really save money with your own labor. For us, it saved about €10,000 for roughly a week of work.

Best regards,

Andreas

Thank you for your feedback.
I will look into "Schliebe" and "ventilation." Maybe this gentleman can also help me. Where is he from? We are building north of Stuttgart.
I will also check out the Zehnder 350. Very quiet sounds promising.
And the tip about the soundproof door is a good one.
Once you have the heating, ventilation, server, etc. installed, such a door definitely won’t hurt.

Thank you

red-ed schrieb:
Once heating, ventilation, servers, and so on are installed, having a door like that really can't hurt.

With or without a transfer grille?

Mycraft schrieb:
With or without overflow element?

What exactly is an overflow element? I guess I haven’t reached that part in my reading yet.

Soundproof doors are usually airtight as well... so if you want to ventilate the utility room (HAR), you will need either a transfer grille and/or supply/exhaust air vents in the utility room (HAR).