In the process of using air filter, the control of resistance is very important, and the final resistance is one of the most important factors to determine the air filter. We will explain the effect of the final resistance on the air filter for you, and what is the final resistance of air filter?

1, the filter to the airflow resistance, the accumulation of dust filter with the increase of the use of time, when the filter resistance increases to a specified value, the filter will be scrapped.

2. The resistance of new filter is called "initial resistance", and the resistance value when the filter is scrapped is called "final resistance". In some filter samples, there are "final resistance" parameters, and the air conditioning engineer can also change the original design of the product's final resistance value according to the site conditions. In most cases, the final resistance of the filter used in the field is 2-4 times the initial resistance.

3. The recommended final resistance values for various filter efficiency specifications are as follows:

Filter efficiency specification Recommended Final resistance (Pa)

G3(crude) 100-200

G4 (medium and primary) 150-250

F5-f6 (medium and primary) 250-300

F7-f8 (High school) 300-400

F9-h11 (sub-high efficiency) 400-450

High efficiency and sub-high efficiency 400-600

4. Low-efficiency filter usually USES coarse fiber filter material with diameter ≥10 m. Due to the large gap between the fibers, too much resistance may blow the dust accumulation on the filter. At this time, resistance is no longer increased, but the filtration efficiency is zero. Therefore, strictly limit the termination resistance values for filters below G4.

5. In order to ensure the effective use of filters at all levels, it is recommended to install resistance monitoring devices in each filter segment. The cheap resistance monitoring device is a U-tube differential pressure gauge. The inclined tube differential pressure gauge is more accurate than the U tube differential pressure gauge, the appearance is more beautiful, pointer differential pressure gauge grade and price are higher.

6, the automatic control system to the pressure difference control are generally used differential pressure transmitter, differential pressure transmitter can change the resistance into current or voltage signal transmission to the control system, such as add differential pressure switch, can constitute the final resistance alarm device.