Spiral seam pipes for laundry chute? Experiences?

Hello,

we are planning to install a laundry chute as part of our new build.
The laundry chute is to be hidden in the closet of the dressing room on the upper floor. It should be usable from the dressing room on the upper floor and additionally from the adjacent bathroom (for this, a T-piece). On the ground floor, it should protrude about 80 cm from the ceiling, uncovered.

After a brief research, it is probably a pipe with a diameter of 300mm.
As mentioned, we actually do not want to cover the pipe in the utility room.

Now we are faced with the decision of which material to choose:
- KG pipe (cheap, but possibly static charge and the orange color is not nice at all… would have to be covered after all)
- Stainless steel pipe (looks great, but expensive! especially the required T-piece and connectors are very expensive)
- Spiral seam pipe (looks quite good and also cheap, even for the T-piece… but fear that laundry might get damaged because it’s not so smooth and maybe rust eventually?)

Does anyone have experience with a spiral seam pipe as a laundry chute?

Additionally:
- How large should the round openings in the ground floor ceiling and wall between the dressing room and bathroom ideally be for a pipe with a diameter of 300mm… we were thinking about 330mm. We need to inform our general contractor about this as they will make the openings.
- Does anyone know where to get reasonably priced loading doors (round 300mm connection)… The prices of around €250 are really steep for such small doors.

We would be grateful for any tips :)

I can only say that my parents have a KG pipe with 40 cm as a laundry shaft from the bathroom in the attic and the first floor and the utility room on the ground floor down to the basement, and despite insulation, the thing is a great sound transmitter. Through all three floors, you can hear the washing machine in the basement in the rooms adjacent to the pipe, and conversely, in the basement, you can hear every word spoken in the kitchen or the bathroom on the upper floor. And unfortunately, the laundry cannot fly up either. I would not install something like that in my own house.

I can only advise against it. You really don’t want a sound bridge between the bathroom and the HAR / utility room, do you? There is often some humming noise in the HAR, or a dryer / washing machine rattles – you don’t want to hear that when you’re lying in the bathtub, right? We had one planned in our first house, but fortunately decided against it out of respect for the sound. Are your ceilings made of concrete and already finished? Such openings don’t look really neat. At least not in our case. They are usually reinforced with steel, and if you hammer a 33cm hole through them, it won’t be a delicate, perfectly round circle. Since you don’t want to cover it, you will probably have to plaster it afterwards anyway. I don’t have a photo of such an opening from our construction at hand right now, but it would probably be much larger / more misshapen than intended.

I made it with 300 KG pipes. At the top a 300 45-degree branch that goes into the [Kinderbad]. Directly integrated into a 40 cabinet. No flap needed there, I have a cover at the bottom. In the [Elternbad] then integrated into the shelf. Then a cover in DIY.

You can neither hear anything from the utility room / [HAR / Hauswirtschaftsraum] in the basement in the ground floor nor in the bathroom. The media shaft was planned with a disposal shaft from the beginning. The cover at the bottom makes it possible.

we are planning as part of our new construction

it probably means this one:

to install a laundry chute.

check out here: https://www.hausbau-forum.de/threads/waescheabwurf-hygiene-wie-sauber-halten.33672/