The road construction on the street in front taking a long time. It's too noisy to work.
Indeed. This is what we call "noise."
But if I close the window, it's still hot…
I wish I could borrow an axial flow fan from the showroom. (LAUGHS)
...Teasing again.
Oh yes, speaking of noise, you can find the noise level on the fan page of the general catalog.
That’s right. Fans have a wide range of applications. They are used not only in factories, but also in offices and hospitals, so the noise level can be a key factor to make a selection. By the way, did you know that the noise level is measured in the A-range at a distance of 1 m from the fan intake side?
Huh? What's the A-range?
It is said that generally our ears can only hear from 20 Hz to 20k Hz. That's why the noise level is corrected to be closer to human hearing, and this is called the A-range.
I didn't know that! You know everything Ms. Ori! Then I wonder how much noise from that road construction is in the A-range.
Well... construction noise is generally around 110 dB. By the way, Oriental Motor's fans are around 40 dB, the same level as a quiet park.
Really? Yes, but the way you hear noise differs depending on where you listen to it, aren't they?
Good point. Since the noise level changes depending on the distance of the measurement, the catalog always clearly indicates where the measurement was made and how many meters away the measurement was made.
That's true. The catalog makes it clear that the Oriental Motor fan was measured at a distance of 1 m from the inlet side.
If the measurement distance is different, the value will also be different. So you always need to check the measurement distance when you make a comparison.
You may think that the noise level is low because the dB is low, but it could be that the measurement distance is far away.
So we have to be careful about that. There is a regularity in the noise level and distance. For example, if you double the measurement distance from 1 m to 2 m, the noise will drop by 6 dB, and if you move 4 m away, the noise will drop by another 6 dB, or 12 dB in total. On the other hand, when the measurement distance decreases from 1 m to 50 cm, the noise level increases by 6 dB.
I see! So, if you know the noise level at a certain distance, you can estimate the noise level at a different distance.
That's right. Try checking the "Fan FAQ" section of the Oriental Motor website for more on how to calculate noise levels.
Yes, sir! I'll take a look right away.
Oh, it seems like the construction noise has stopped while we're talking.
(stomach growls)
The sound of Vex's stomach is about 30 dB in the A-range. Hey, it's lunchtime.
So that’s why I am so hungry. Ms. Ori, what are you going to eat today?
