ᐅ Controlled residential ventilation in precast concrete slabs – soundproofing?

Hello,

I currently have a small "problem."
I want to embed my mechanical ventilation system directly into the precast concrete slab. This is basically not a problem and is pretty standard nowadays.
However, I don’t want to run every duct through the ceiling into the utility room; instead, I want to embed the air distribution boxes directly into the slab and only run the two DN160 (6-inch) ducts for supply and exhaust air through the ceiling into the utility room. I find this solution cleaner and neater.
I have been looking for distribution boxes suitable for precast slabs but haven’t found anything useful so far. Some suppliers offer boxes that are only 10cm (4 inches) high and would fit, but these are not insulated. The question is whether insulation is really necessary if the units are cast directly into the concrete slab?
The sound-insulated boxes are usually between 17 and 20cm (7 to 8 inches) high, which is quite tight for our ceiling (24cm (9.5 inches) total: 5cm (2 inches) precast slab + 19cm (7.5 inches) concrete). In this case, there wouldn’t be enough concrete coverage.
Maybe someone here has experience with this or knows more about it.

I need 2x 8x75 distribution boxes, main connection DN160 (6 inches). The ventilation system will be a Viessmann Vitovent 300F, which is connected directly to the air-to-water heat pump.

Thanks in advance.

Best regards,
Daniel

You don’t do it like that; you have to be able to access it sometimes.
For example, Helios distributors are mounted on the wall, with the pipe outlets at ceiling level, and the 160mm (6 inches) pipe connects from below.

Thank you for the reply.

Question: what exactly do you need to access there again? The pipes are already inside the ceiling, and there’s nothing else at the distributor. Only air flows through those.

Do you happen to have a picture of the Helios distributors?

brauk346 schrieb:

Now, I don’t want every duct running through the ceiling into the utility room. Instead, I want to embed the air distribution boxes directly in the concrete and only have the two DN160 (6.3-inch) pipes for supply and exhaust air going through the ceiling into the utility room. I find this solution cleaner and more elegant.

You need corresponding recesses in the reinforced concrete ceiling, and then you can install and embed any distribution box there. As far as I know, this is also standard practice?

The distribution boxes need to remain accessible for maintenance, so it is not standard practice to embed them in concrete – I have never seen that done.

Here is a picture showing the area between the screed and the control cabinet, but it’s also possible to place it inside the control cabinet.

Hello @Lumpi_LE

At our place, it looks like in the first picture. That’s how I meant the embedding in concrete as well.