ᐅ Controlled Residential Ventilation System – Decision Guide
Created on: 22 Oct 2017 11:14
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baumhaus815
Hello everyone,
We have decided to build with GÜ, and construction is about to start soon. Now we need to choose a specific mechanical ventilation with heat recovery system.
The single-family house has three floors (basement, ground floor, upper floor), and the floor area of each level is about 80 sqm (860 sq ft). The mechanical ventilation system is planned only for the ground and upper floors, not for the basement.
We are currently choosing between two systems: the Zehnder Comfoair Q350 and the Wolf CWL-300. The Wolf system would be 1,700 euros cheaper overall (including ductwork, installation, etc.).
From what I understand, the Comfoair Q350 is the newer system, has lower noise levels, and a higher heat recovery efficiency. Additionally, it is dimensioned for 50 m3 (1,765 cu ft) more airflow than the CWL-300, which might mean it could run at a lower fan setting during normal operation, making it quieter and more economical.
Our considerations now are: Do the lower measured noise levels actually make a noticeable difference in everyday use (or only under laboratory conditions)? Regarding the system sizing: In theory, 300 m3 (10,595 cu ft) max capacity would be sufficient for us, but would 350 m3 (12,366 cu ft) be better in practice? Ultimately, the Comfoair Q350 is probably the better system, but we wonder if the additional 1,700 euro cost is worth it for our house.
Which mechanical ventilation with heat recovery system would you recommend as experts? As non-professionals, it’s quite difficult for us to make the right choice.
Thanks in advance!
We have decided to build with GÜ, and construction is about to start soon. Now we need to choose a specific mechanical ventilation with heat recovery system.
The single-family house has three floors (basement, ground floor, upper floor), and the floor area of each level is about 80 sqm (860 sq ft). The mechanical ventilation system is planned only for the ground and upper floors, not for the basement.
We are currently choosing between two systems: the Zehnder Comfoair Q350 and the Wolf CWL-300. The Wolf system would be 1,700 euros cheaper overall (including ductwork, installation, etc.).
From what I understand, the Comfoair Q350 is the newer system, has lower noise levels, and a higher heat recovery efficiency. Additionally, it is dimensioned for 50 m3 (1,765 cu ft) more airflow than the CWL-300, which might mean it could run at a lower fan setting during normal operation, making it quieter and more economical.
Our considerations now are: Do the lower measured noise levels actually make a noticeable difference in everyday use (or only under laboratory conditions)? Regarding the system sizing: In theory, 300 m3 (10,595 cu ft) max capacity would be sufficient for us, but would 350 m3 (12,366 cu ft) be better in practice? Ultimately, the Comfoair Q350 is probably the better system, but we wonder if the additional 1,700 euro cost is worth it for our house.
Which mechanical ventilation with heat recovery system would you recommend as experts? As non-professionals, it’s quite difficult for us to make the right choice.
Thanks in advance!
We also chose the Zehnder ventilation system, reportedly the quietest unit on the market. Our neighbors have a very loud ventilation system that they can only run on the lowest setting because otherwise, you can hear it outside from 20 meters (65 feet) away. So, I would definitely make sure the unit is as quiet as possible.
Best regards,
Sabine
Best regards,
Sabine
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stefanc843 Nov 2017 00:17Curly schrieb:
We also chose the Zehnder ventilation system, reportedly the quietest unit on the market. Our neighbors have a very loud ventilation system that they can only run on the lowest setting; otherwise, you can hear it 20 meters (65 feet) away outside. I would definitely make sure the unit is as quiet as possible.
Best regards,
Sabine Do you know which unit the neighbors have?
Curly schrieb:
a Pluggit.
Best regards,
SabineGood to know. Our construction company wanted to sell us a Pluggit. It was always part of the contract. However, we have now planned with a Zehnder.R
readytorumble3 Nov 2017 13:45Is the unit installed indoors but still noisy outside?
Our mechanical ventilation system from Pluggit is located outdoors about 2.5m (8 feet) below the air intake grille and is inaudible on the lowest setting (which it runs on for 20 hours a day). On setting 2, you can hear a very slight rustling sound when it is completely quiet.
The exhaust air is vented through the roof and cannot be heard anywhere.
Our mechanical ventilation system from Pluggit is located outdoors about 2.5m (8 feet) below the air intake grille and is inaudible on the lowest setting (which it runs on for 20 hours a day). On setting 2, you can hear a very slight rustling sound when it is completely quiet.
The exhaust air is vented through the roof and cannot be heard anywhere.
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baumhaus81518 Jan 2018 20:58We now need to make a concrete decision between the Zehnder Comfoair Q350 and the Wolf CWL-300 Excellent. As I mentioned before, the Wolf is significantly cheaper.
According to the Passive House Institute database, the Zehnder system is noticeably quieter: supply/exhaust 52 / 39 dB(A) compared to Wolf with 67 / 59 dB(A) for supply/exhaust. I think these are quite significant differences...
Does anyone know why there are such large differences in noise levels? After all, both units only involve air flowing in and out at the wall inlets and outlets, including the valves. Of course, the noise from the actual device in the basement will vary, but why are there such differences at the outlets in the living areas?
Do you think these noise level differences will be strongly noticeable in everyday life, meaning when you’re not specifically focusing on the ventilation system? What’s your opinion?
According to the Passive House Institute database, the Zehnder system is noticeably quieter: supply/exhaust 52 / 39 dB(A) compared to Wolf with 67 / 59 dB(A) for supply/exhaust. I think these are quite significant differences...
Does anyone know why there are such large differences in noise levels? After all, both units only involve air flowing in and out at the wall inlets and outlets, including the valves. Of course, the noise from the actual device in the basement will vary, but why are there such differences at the outlets in the living areas?
Do you think these noise level differences will be strongly noticeable in everyday life, meaning when you’re not specifically focusing on the ventilation system? What’s your opinion?
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