Hello everyone,
We have the ventilation system mentioned above, planned and purchased from Selfio.
I have now started taking measurements.
For measuring, I used the Testo 417 with the appropriate funnels.
The exhaust airflow matches very well with what is shown on the system, I believe there is a difference of about 3m³/h (about 1 cubic foot per minute).
The supply air differs quite significantly with 368m³/h (about 217 cubic feet per minute); I measured the values directly at the unit, which roughly corresponds to what is displayed on the screen, except for about a 10% difference.
I don’t know how overpressure feels, but generally, when opening and closing doors in the individual rooms, I don’t notice any difference between the system being on or off.
Therefore, I set a correction factor for the supply air measurement on the device.
The values currently look like this. I will need to adjust the supply air a bit more; I think the exhaust air is already fitting quite well.
Now my questions are as follows:
1. Is it okay to use the correction factor like this?
2. The system shows a difference between supply and exhaust air of about 10m³/h (about 6 cubic feet per minute). Should I correct this at the unit, or is it negligible?
3. Despite having pipes laid out in a star pattern and installed telephone sound attenuators, we have problems with telephone noise. I also wonder what the attenuators are supposed to achieve if they are meant to be installed behind the air distributors. What can be done about this? The exhaust air is noticeably more affected than the supply air.
Thanks in advance.
Best regards, Alex
We have the ventilation system mentioned above, planned and purchased from Selfio.
I have now started taking measurements.
For measuring, I used the Testo 417 with the appropriate funnels.
The exhaust airflow matches very well with what is shown on the system, I believe there is a difference of about 3m³/h (about 1 cubic foot per minute).
The supply air differs quite significantly with 368m³/h (about 217 cubic feet per minute); I measured the values directly at the unit, which roughly corresponds to what is displayed on the screen, except for about a 10% difference.
I don’t know how overpressure feels, but generally, when opening and closing doors in the individual rooms, I don’t notice any difference between the system being on or off.
Therefore, I set a correction factor for the supply air measurement on the device.
The values currently look like this. I will need to adjust the supply air a bit more; I think the exhaust air is already fitting quite well.
Now my questions are as follows:
1. Is it okay to use the correction factor like this?
2. The system shows a difference between supply and exhaust air of about 10m³/h (about 6 cubic feet per minute). Should I correct this at the unit, or is it negligible?
3. Despite having pipes laid out in a star pattern and installed telephone sound attenuators, we have problems with telephone noise. I also wonder what the attenuators are supposed to achieve if they are meant to be installed behind the air distributors. What can be done about this? The exhaust air is noticeably more affected than the supply air.
Thanks in advance.
Best regards, Alex
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