How to judge whether the filters of junior high school colleges have been scrapped!
- 2019-08-22-

The problem of junior high-efficiency filter invalidation is an important problem that users have to face. It is correctly judged that the junior high-efficiency filter has been invalidated, and the corresponding junior high-efficiency filter replacement plan can be completed. Through our collection, there are two kinds. The situation can be determined that the junior high efficiency filter is invalid:
First, when doing environmental testing, it was found that the suspended particles in the room were obviously high. After other reasons were excluded, the diffuser plate of the high-efficiency air supply port was removed, and the air outlet was damaged and black ash. In this phenomenon, the junior high school was highly efficient. The filter cannot be used and the new filter is replaced in time. If there is no obvious damage to the filter, the air supply volume of each air supply port is measured by the air outlet of the air volume cover, and the air supply volume becomes large and replaced.
Second, if there is no abnormality in other air filters, if the air supply volume of the room air outlet is less than half of the standard air supply volume, the filter is blocked and the blocked junior high-efficiency filter should be replaced.
Replacement of junior high efficiency filter:
Remove the diffuser plate for the high-efficiency filter for the junior high school; loosen the fixing member of the high-efficiency filter for the junior high school, remove the high-efficiency filter for the junior high school, check the static pressure box, the fixing parts and the panel for corrosion and loss, and find the rust and remove the rust. And painted. According to the standard and quantity, the new junior high-efficiency filter is used. The outer packaging of the high-efficiency filter should be intact and without damage. The certificate of the junior high-efficiency filter should be complete, the outer frame should be strong and durable, and the filter paper should be free from damage. After being placed in a clean and boring place, the inner packaging should be indispensable before the device.
When replacing some of the junior high-efficiency filters in the clean area, clean the static pressure box of the junior high-efficiency filter with a clean rag, then open the middle-load high-efficiency filter inner package and paste the seal to the air inlet side of the junior high-efficiency filter. Smoothly put the junior high-efficiency filter into the static pressure box. When transferring, be sure to take care of it and record the standard model number, number and device orientation of the junior high-efficiency filter. When fixing the filter, first check the filter at the center of the static pressure box. The filter is equivalent to the distance around the static pressure box. The fixing parts should be fixed at an angle to avoid uneven force or damage the filter. The fixing nut in the static pressure box should be tightened to make the connection between the junior high-efficiency filter and the static pressure box match and seal. Then open the air conditioning unit, after ventilating the system, open the middle-load high-efficiency filter inner packaging and replace it according to the above process.
After installing the junior high-efficiency filter, run the system to see if there is any air leakage. When air leakage is found, do the following: tighten the fixture or replace the seal and remove the wind from the head device, the high-efficiency filter itself, you need to replace the new junior high-efficiency filter. Next, the high-efficiency filter panel is installed in the middle school. When the device is installed, the device is marked in the original direction, and the interface between the panel and the ceiling is minimized to avoid dust accumulation. After the junior high-efficiency filter device, the environmental test should be carried out from the beginning and verified to provide a reliable basis for the next confirmation of the junior high-efficiency filter.