ᐅ Centralized ventilation system ductwork entirely routed through the attic?
Created on: 27 Dec 2024 17:09
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oese123Hello everyone, I joined this forum because we are planning to build a bungalow. Currently, two questions remain open: besides the heat supply (we are currently leaning towards a ground-source heat pump with earth collectors or a ring trench), it’s the ventilation system. At first, we considered a decentralized system since we ventilate a lot anyway and thought of it as an add-on. After researching the topic more thoroughly, however, we realized that you probably can’t ventilate as much or as controlled with such a system, and a continuously running decentralized ventilation might be disturbing due to noise.
So here is my question: We are planning a bungalow with a wooden intermediate ceiling, insulation in the ceiling, and an unfinished attic. We want to use parts of the attic for storage, for example for Christmas items and the like. Before I start deeper discussions with the installer, I would like to know whether loosely laying the ducts in the attic and leading them through the suspended ceiling would make sense? This would have the advantage that we could easily access the ducts at any time, which gives us some peace of mind. Another general contractor suggested embedding the ducts in the screed, but with the now contracted companies, we have not spoken in detail yet, except for the general contractor.
Thanks for your advice!
So here is my question: We are planning a bungalow with a wooden intermediate ceiling, insulation in the ceiling, and an unfinished attic. We want to use parts of the attic for storage, for example for Christmas items and the like. Before I start deeper discussions with the installer, I would like to know whether loosely laying the ducts in the attic and leading them through the suspended ceiling would make sense? This would have the advantage that we could easily access the ducts at any time, which gives us some peace of mind. Another general contractor suggested embedding the ducts in the screed, but with the now contracted companies, we have not spoken in detail yet, except for the general contractor.
Thanks for your advice!
With a different search, I have now found a suitable thread here: https://www.hausbau-forum.de/threads/kontrollierte-wohnraumlueftung-in-bungalow-decke-abhaengen-noetig.31588/, so I will start by reading through it. By the way, the unit itself is supposed to be located in the utility room, not in the attic.
oese123 schrieb:
The advantage would be that we could access the pipes at any time, which gives us a somewhat secure feeling.It won’t be that easy to access your pipes, because you have to insulate them if they are located outside the thermal envelope.And you can still access the pipes if needed by cutting open the insulation and resealing it with, for example, aluminum adhesive tape (if mineral wool with aluminum foil facing was used).
However, you usually don’t need to access them. After about seven years, I checked with a probe and found nothing.
The system only becomes noisy if too much air is moved through a single duct or pipe. I don’t recall the exact "critical" limit, but airspeeds above 2m/s (6.6 ft/s) should be perfectly fine.
Also, sound attenuators installed before each outlet in the attic work wonders; otherwise, you may end up hearing conversations from other rooms.
Oh, and I also recommend throttle dampers before each outlet in the attic as this makes balancing the airflow through the ducts much easier.
A filter for the incoming outside air protects the unit from coarse dirt inside. An intake air filter keeps the ducts clean, and if it’s an F7 filter, pollen is generally not a problem anymore. An exhaust air filter in the outlets (usually G2) also keeps them nice and clean.
However, you usually don’t need to access them. After about seven years, I checked with a probe and found nothing.
The system only becomes noisy if too much air is moved through a single duct or pipe. I don’t recall the exact "critical" limit, but airspeeds above 2m/s (6.6 ft/s) should be perfectly fine.
Also, sound attenuators installed before each outlet in the attic work wonders; otherwise, you may end up hearing conversations from other rooms.
Oh, and I also recommend throttle dampers before each outlet in the attic as this makes balancing the airflow through the ducts much easier.
A filter for the incoming outside air protects the unit from coarse dirt inside. An intake air filter keeps the ducts clean, and if it’s an F7 filter, pollen is generally not a problem anymore. An exhaust air filter in the outlets (usually G2) also keeps them nice and clean.
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