How to determine whether you need to replace the air filter purification workshop.

How can the air filter in the cleaning room need to be replaced?
People often ask, what kind of air filter is the top of the air filter? Is more expensive, the better filtering effect? In addition, how to identify whether the air filter replacement and so on? Series, today we have to focus on that, how to judge whether the replacement of the air filter the problem.
Here, we say, is not the more expensive the better air filters, of course this is for domestic air filter market confusion, how to judge whether the replacement of an air filter? First we should judge from the following points:
1, we need to observe, observe carefully the air filter, if there is a dark or black, if the air filter was black, so this time, this is due to the replacement of the air filter.
2, the same also needs us to carefully observe, generally will soon be broken air filter will appear discouraged phenomenon, if we find, then you need to change.
3, third points belong to the maintenance, if we find that there are a lot of dust around the air filter, so this time we need the following cleaning, if after cleaning the filter, the effect is not good, it will need to be replaced.