ᐅ Central Ventilation System – Air Outlet in the Floor or Ceiling?
Created on: 31 Oct 2021 22:23
H
HoisleBauer22
Hello home construction enthusiasts,
In a scope of work description, it states: "The supply air is provided through floor-level supply outlets with white cover grilles, for example in the living room, master bedroom, and children's rooms (if such rooms exist). By combining supply and exhaust rooms, the hallway is used as a transfer area. This means that the room doors have a gap of about 1 cm (0.4 inches) above the finished floor."
My question is: Do these floor-level supply outlets make sense? Is this meant to reduce drafts from above? I suspect that the solid construction company uses this as a standard because the ducts are installed in the floor (with impact sound insulation and heating inside) rather than suspending the ceiling.
Personally, I would prefer supply AND exhaust air in the ceiling (this seems more sensible to me, since if the air comes from below, furniture like cabinets could block it). But if both supply and exhaust are to come from the ceiling, wouldn’t you need to drill a hole through the intermediate ceiling (if you want the outlet on the ceiling in the ground and upper floors) or the basement ceiling (if you want the outlet on the ceiling in the basement)?
Thank you very much for your advice.
This interesting topic was not continued in the other thread:
Source: https://www.hausbau-forum.de/threads/kwl-planung-position-der-komponenten-laenge-der-leitungen.39567/post-529840
Source: https://www.hausbau-forum.de/threads/kwl-positionierung-der-zu-und-abluft-in-meinen-entwuerfen.36750/post-440380
In a scope of work description, it states: "The supply air is provided through floor-level supply outlets with white cover grilles, for example in the living room, master bedroom, and children's rooms (if such rooms exist). By combining supply and exhaust rooms, the hallway is used as a transfer area. This means that the room doors have a gap of about 1 cm (0.4 inches) above the finished floor."
My question is: Do these floor-level supply outlets make sense? Is this meant to reduce drafts from above? I suspect that the solid construction company uses this as a standard because the ducts are installed in the floor (with impact sound insulation and heating inside) rather than suspending the ceiling.
Personally, I would prefer supply AND exhaust air in the ceiling (this seems more sensible to me, since if the air comes from below, furniture like cabinets could block it). But if both supply and exhaust are to come from the ceiling, wouldn’t you need to drill a hole through the intermediate ceiling (if you want the outlet on the ceiling in the ground and upper floors) or the basement ceiling (if you want the outlet on the ceiling in the basement)?
Thank you very much for your advice.
This interesting topic was not continued in the other thread:
schaaaf schrieb:
I don’t like to revive old topics, but I would like to hear arguments why the floor is preferred? Does this apply to both supply and exhaust air? Against floor outlets would speak the "suction" of dust and the stirring up of dust and the issue of furniture.
Source: https://www.hausbau-forum.de/threads/kwl-planung-position-der-komponenten-laenge-der-leitungen.39567/post-529840
Shiny86 schrieb:
My concerns about floor valves were in case something is spilled. But maybe that is rather unlikely. If vacuuming is enough for cleaning, then great. I didn’t know I was allowed to put something on top of the floor valves. For example, in the bedroom I could imagine a chair where clothes might be placed sometime.
So would you leave all positions as they are?
In the living room, I would move it though. Otherwise, there might be a draft when sitting on the sofa right above.
Suspending the ceiling on the upper floor is not an option for me. Can floor outlets also be installed in the dining room and living room? Then a sofa with legs can be placed there. I need a sofa with legs anyway for my robot vacuum cleaner.
And in the kitchen, maybe a wall outlet? Or does one have to have the same type of outlet throughout a single floor?
Source: https://www.hausbau-forum.de/threads/kwl-positionierung-der-zu-und-abluft-in-meinen-entwuerfen.36750/post-440380
HoisleBauer22 schrieb:
What I’m still wondering is: Are wall outlet valves used in solid construction? Where would the pipe go then? In our entire house, the exhaust air is installed in the ceiling and the supply air in the walls, approximately 20cm (8 inches) above the finished floor level at the center of the valve. Both locations have diffuser valves installed. The ducts for the supply air run through the floor and then through the 45.5cm (18 inches) aerated concrete wall.
The picture shows one of the wall connections for the supply air on the upper floor. In the foreground is the connection for the exhaust air in the ceiling of the ground floor below.
H
HoisleBauer221 Nov 2021 09:01@AxelH.: Thanks a lot for the photo! More like that would be great! It really helps me visualize how it looks. With 45.5 cm (18 inches) and aerated concrete, there’s enough space for the pipe to go all the way down (or up into the attic?) to the room where your ventilation system is located. But with hollow brick, I’m afraid that probably won’t work since it tends to crumble, right?
Very interesting! Am I correct in understanding that if supply and exhaust air are balanced equally in each room (including the bathroom), I can seal the bottom of the doors to improve soundproofing?
Strahleman schrieb:
As an alternative to the gap under the door, there are also flat door seals that allow air exchange with the door closed (overflow seals). Be aware, though, these only allow a limited amount of airflow in cubic meters per hour; the rest has to flow under the door. Another option is to install overflow vents in the door frames, but these tend to be disproportionately expensive if professionally installed.
Very interesting! Am I correct in understanding that if supply and exhaust air are balanced equally in each room (including the bathroom), I can seal the bottom of the doors to improve soundproofing?
HoisleBauer22 schrieb:
Very interesting! Am I correct in understanding that if each room (including the bathroom) has both supply and exhaust air, I can seal the doors at the bottom and thus achieve better sound insulation?You are correct, but this results in significantly higher planning and installation costs. However, designing the ventilation system room by room and according to actual needs certainly has its advantages.I would pragmatically decide based on whether the ventilation is part of the air conditioning system.
So, if the supply air distributes pre-cooled air in summer, the outlet should of course be positioned at the top. If it also delivers warm air in winter, then naturally the outlet should be at the bottom.
So, if the supply air distributes pre-cooled air in summer, the outlet should of course be positioned at the top. If it also delivers warm air in winter, then naturally the outlet should be at the bottom.
HoisleBauer22 schrieb:
@AxelH.: Thank you very much for the photo! More of those, please! It helps me better visualize how it looks. With 45.5cm (18 inches) and aerated concrete, there is enough space for the pipe all the way down (or up into the attic?) to the room where your ventilation system is located. But with perforated bricks, I’m afraid it might not work—the brick could crumble, right?Hello HoisleBauer22,the aerated concrete blocks were only channeled from the top of the unfinished floor slab down to the stub for the disc valve. I’m sure perforated bricks (which I have no experience with) can be done the same way using an angle grinder. All other pipes run under the screed. From the upstairs bathroom, they then go down behind a drywall partition.
Here is a photo from the ground floor bathroom where you can clearly see the pipes in front of the wall.
Here, too, everything later disappeared behind a drywall partition.
Below both bathrooms is the technical room in the basement, where all pipes end and connect to the ventilation unit (on the left wall in the picture; the drainage pipe is for condensate).
Similar topics