Hello,
I have the following issue:
We live in a single-family house with 170 sqm (1830 sq ft) of living space plus a 55 sqm (590 sq ft) basement. The whole house is ventilated with a Wolf CWL 400 ventilation system.
Currently, there are three of us living in the house. My wife works Monday to Thursday until 3 PM, and after that, our child also comes home.
This means that from Monday to Thursday between 3 PM and 7 AM, 2-3 people are present, on Fridays two people are present all day, and on weekends, three people.
In the mornings, we additionally ventilate the sleeping area and bathroom manually. Cooking fumes are extracted outside via the range hood. There are no particular odor sources.
The system is set to circulate 125 cubic meters per hour (about 74 cubic feet per minute) at night and 230 cubic meters per hour (135 cubic feet per minute) during the day.
It should be noted that the sleeping area has a relatively large volume due to an open attic space. Nevertheless, the air feels stale in the morning.
At night, the ventilation system cannot be set to a higher level because the noise level would then be disturbing.
During daytime operation, the ventilation is audible but not particularly disruptive. However, it is quite loud, especially in the kitchen. This surprises me because the system can deliver up to 400 cubic meters per hour (235 cubic feet per minute), although that would be very loud and disturbing.
My question now is: Is the system set too low at night? Too high during the day? Is the noise level at this "low" setting normal? I have the impression that the exhaust air valves are particularly noticeable in terms of sound, while the supply air is relatively quiet.
I have the following issue:
We live in a single-family house with 170 sqm (1830 sq ft) of living space plus a 55 sqm (590 sq ft) basement. The whole house is ventilated with a Wolf CWL 400 ventilation system.
Currently, there are three of us living in the house. My wife works Monday to Thursday until 3 PM, and after that, our child also comes home.
This means that from Monday to Thursday between 3 PM and 7 AM, 2-3 people are present, on Fridays two people are present all day, and on weekends, three people.
In the mornings, we additionally ventilate the sleeping area and bathroom manually. Cooking fumes are extracted outside via the range hood. There are no particular odor sources.
The system is set to circulate 125 cubic meters per hour (about 74 cubic feet per minute) at night and 230 cubic meters per hour (135 cubic feet per minute) during the day.
It should be noted that the sleeping area has a relatively large volume due to an open attic space. Nevertheless, the air feels stale in the morning.
At night, the ventilation system cannot be set to a higher level because the noise level would then be disturbing.
During daytime operation, the ventilation is audible but not particularly disruptive. However, it is quite loud, especially in the kitchen. This surprises me because the system can deliver up to 400 cubic meters per hour (235 cubic feet per minute), although that would be very loud and disturbing.
My question now is: Is the system set too low at night? Too high during the day? Is the noise level at this "low" setting normal? I have the impression that the exhaust air valves are particularly noticeable in terms of sound, while the supply air is relatively quiet.
B
BBaumeister6 Oct 2021 11:44I have made some progress. I received the mentioned silencers and discovered something surprising during installation. Our ventilation valves are from Helios, and until now, I assumed they didn’t contain any filters. However, when I removed the first exhaust valve, I was shocked to find about 2 cm (0.8 inches) of dust on the fleece mat inside. Since these exhaust valves are installed in the bathrooms, the dust had a waxy consistency. After the initial shock, I cleaned everything thoroughly, and the ventilation system became so quiet that I only installed the silencers in the bedroom and returned the rest.
BBaumeister schrieb:
... was was concerning to find that there was literally about 2 cm (1 inch) thick layer of dust on the fleece mat inside. Since the exhaust vents are located in the bathrooms, this dust has more of a waxy consistency.That’s why I mentioned in #12 that the filter inserts should be easy to maintain.
For years, I have been using disposable filter inserts (fleece mats) by gently rinsing them in water with surfactants until they turn white again. Just shake off the excess water lightly, do not wring them! Then reinstall them while still damp. When the ventilation is running, they dry quickly.
We had been wondering for a while about a faint whistling noise coming from the air intake vents. Then we came up with the clever idea to replace them. And voilà, everything is quiet again.
Especially at the beginning, they tend to clog up quite quickly. The garden outside isn’t done yet, there’s construction next door, and our own build is still kicking up quite a bit of dust.
Especially at the beginning, they tend to clog up quite quickly. The garden outside isn’t done yet, there’s construction next door, and our own build is still kicking up quite a bit of dust.
B
BBaumeister7 Oct 2021 14:36Evolith schrieb:
We were puzzled for a while by a faint whistling sound coming from the air intake vents. Then we had the brilliant idea to replace them. And voilà, everything was quiet again.
Especially at the beginning, they clog up quite quickly. The garden outside wasn’t done yet, there was a construction site next door, and our own build was still creating quite a bit of dust. It was exactly the same for us. At first, there was a lot of construction around, the street was still a construction road with the associated dust, the garden wasn’t finished yet, and inside the house they were still cutting parquet, drilling holes here and there, etc. On top of that, the location is in the middle of greenery where a lot is blooming. The large filter in the ventilation system itself, which filters the fresh air, had to be changed every three months. I hadn’t realized until now that the exhaust vents inside the house also have filters. Basically, only the kitchen was properly vacuumed (where the filters were clearly visible), and it was extremely loud there.
konibar schrieb:
I have been using disposable filter inserts (fleece mats) for years by gently rinsing them in water with surfactants until they turn white again. Just shake off excess water lightly, do not wring! Then reinstall while still (slightly) damp. When the ventilation is running, they dry quickly. I also occasionally hand-wash a fleece filter cone with a small amount of detergent and plenty of water if I forgot to order replacements, but:
I would recommend hanging the filters to dry on a clothes dryer first and only reinstalling them completely dry. Unnecessary moisture combined with pipes that are not easily accessible is not a good combination.
And yes, I also change mine more often than recommended, always when I notice an increase in noise. It’s really quick to do.
Of course, switch the system off beforehand or activate filter replacement mode so that no unnecessary dust enters the exhaust system.
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