ᐅ Central mechanical ventilation with heat recovery: supply and exhaust air, door undercut

Created on: 29 Apr 2017 16:22
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bluminger
Hello.

We are currently planning the supply and exhaust air outlets for the (concrete) ceilings.
So far, the layout is as follows:

Basement: Exhaust air in all rooms except the storage cellar (currently no supply or exhaust air)
Ground floor: Dining/living/kitchen area (one open space) with both supply and exhaust air, office with supply air, bathroom with exhaust air
Top floor: Bedrooms and children's rooms with supply air, bathroom with exhaust air

A door gap of 5-8mm (0.2–0.3 inches) has been recommended for the room doors to avoid issues with air transfer.

Questions:
Are your ventilation concepts similar? Any experiences?
Does supply air work effectively only through air transfer under the door (in the basement, air would have to pass through the stairwell)?
What are your thoughts on the door gap (5mm (0.2 inches) seems common to me)?

Thanks in advance.
B
Bieber0815
4 May 2017 14:10
There are also soundproofed overflow solutions, for example in the form of special drop seals.
A
Aliban2014
4 May 2017 17:44
Has anyone experienced issues with the noise level of the supply air?

Assuming the supply air for the system in the technical room is not far from the outdoor unit of the air-to-water heat pump, does the noise then enter the house?
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Bieber0815
4 May 2017 20:11
Aliban2014 schrieb:
Assuming the fresh air intake for the system in the utility room is not far from the outdoor unit of the air-to-water heat pump, does the noise then "enter the house"?

No, we have the fresh air intake located above the outdoor unit of the heat pump. There are no issues. In the main air duct, behind the central unit, there is a silencer, so at the respective supply air outlets in the rooms (to our ears) nothing can be heard. I find the central unit itself noisy, but outside the utility room it is not noticeable (we have a soundproof door with a drop seal; I don’t know how it would be without one).
tomtom794 May 2017 23:01
Bieber0815 schrieb:
There are also soundproof overflow solutions, for example in the form of special drop seals.

Soundproof is also airtight, so the Schallex seal should only be used in specific rooms.

And an 8mm (0.3 inch) gap—sorry, you will see everything through the bottom.
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Bieber0815
5 May 2017 07:32
tomtom79 schrieb:
Soundproof also means airtight

No, at least within the practically relevant audible range. There are specifically overflow elements with effective sound insulation (Planet Mine-S as an example).
tomtom795 May 2017 08:01
Thank you very much for the clarification. There are indeed numerous variations. Anyone who willingly allows an 8mm (0.3 inch) gap as an overflow is either deaf or unaware of any alternatives.

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