在 “Should air purifiers have the filter on the front or back?” 上有 4 条评论

  1. If you take a fan and while working place a hand in front of it and another in the back of it, the strength of flow is much larger on the front. It is therefore more efficient to place the filter in front of the fan. Just don´t use it to hard so that the filter doesn´t get damaged, seal anything between the filter and a bit more that where the fan is and clean the fan once every 6 months.
    The only question I have is how far the filter must be from the fan for better results. Any numbers for this?

    1. Great insight Ignacio! I’ve had exactly the same thought. Whilst it often feels like air going into a fan is much less than air going out of the fan (I think it’s to do with the way we ‘feel’ air), the truth is that the amount of air going into the fan is exactly the same as the amount of air coming out of the fan. If it wasn’t the case, then the air would be ‘disappearing’ into some black hole inside the fan!

      Regarding your question of how far the filter should be from the fan. We’ve run some tests, and optimally, the filter should be at least 5-10cm from the fan. That way, the air flowing through the filter is more uniform and will give a better total airflow.

  2. Hi, I tried to make my own and I placed the filter on the front. It turns out that 99.5% of the air gets kicked back and only 0.5% passes through the filter. What is wrong? The filter belongs to an air filter machine for home use (around 40 watts) and my fan is 52 watts!
    Thanks

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