Whether it is efficient or early / in effect, when put into use, and adjust the system to meet our requirements (such as the valve opening volume, the amount of air flow to determine the amount of air) We measure and record this is the middle and high efficiency filter Of the parameters, such as wind speed, resistance, and then the next test, we determine the system does not change, only to re-test their wind speed, resistance, which can determine whether to replace the air filter. But in reality, we may not have identified and fixed these parameters (such as marking the opening size of each valve), but see the pressure is not qualified, free to adjust the size of the return window, and sometimes even adjust the air valve Of the open degree, thus undermining the balance of the entire system. 2, and then leak test, to determine no leakage on the basis of the basic calculation of the wind speed to determine the wind speed is not blocked, and the wind speed is uniform and achieve the required value; Detection of qualified. This is the current domestic practice more recognized. But the DOP price is high, so it is not likely to measure once every six months, in addition to the risk of blocking efficiency. So it was proposed to measure the resistance method. That is, in each high-efficiency head-mounted differential pressure meter, or open the test hole. And then through the resistance changes to determine whether the need for replacement efficiency. But also to achieve automatic monitoring. This is said to be the current practice abroad. They do so after the efficient life of up to 3 years. And our domestic life may be basically less than 1 year of high efficiency. In addition to the high quality of their own reasons, but also with our use of methods, testing methods such as a great relationship.
