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# How to calculate the air volume of HEPA filter correctly?

The air volume of HEPA filter is calculated from the rated air volume of 484X484X220mm to 1000m, the rated air volume of 610X610X150mm HEPA filter to 1500m, and the rated air volume of 320X320X220 HEPA filter to 500m.

The air ratings for HEPA filters These air ratings are actually the maximum allowable air, and they are often discounted in practice. Many users price by air volume, so the filter seller does not actively crowd out the "moisture" in the rated data.

Designers have become accustomed to the bluster of the maker, and when designing, they take the "guarantee... The coefficient "squeezes out the water. 610mm series filter air volume data is more real, generally do not need to consider the protection... The coefficient.

Unidirectional flow clean room filter wind speed is generally between 0.2-0.5m /s, filter detection is mostly carried out under the condition of 0.45m/s. At this time the filter is about rated wind speed, not air volume.

In the early days, the air rating for HEPA filters was defined as the air rate at which the initial filter resistance did not exceed 1 inch water column (250Pa). Now, this regulation has not much practical significance, the general HEPA filter initial resistance has been significantly lower than that resistance.

How to calculate the air volume of HEPA filter is standard?

The air volume of high efficiency filter can also be calculated in this way. The air volume of high efficiency air filter is generally determined according to the wind speed and size of the high efficiency filter; Generally, the rated wind speed of the HEPA filter is between 0.3-0.6M/S, and the median value can be 0.45; For example, we all know that the size of the 1000 air volume high efficiency filter is :484*484*220 conversion will come out!

Generally, the determined wind speed of the HEPA filter is between 0.3-0.6M/S, and the median value can be 0.45;

For example, we all know that the size of the 1000 air high efficiency filter is :484*484*220 after conversion.

This method is simple, but not exact enough. There are more accurate methods.

Hepa filter air volume can be calculated this way

To the national standard 484*484*220 high efficiency filter to calculate:

The rated air volume is 1000M3/H and the initial resistance is 200PA

1. The disassembly number of filter paper is 28 folds /10CM;

2. Calculation of effective area of filter paper :0.475*0.475*280*0.2*2=25.27 square meters, where :0.475 is the effective length of filter paper;

3. 0.475 is the effective width of filter paper, 280 is the 1 meter filter paper folded double layer, 0.2 is the actual height of filter paper;

4, filter paper section wind speed, 1000/36/25.27 =0.011 m/s, that is to say, when the wind speed through the filter paper section at 0.011 m/s, the initial resistance of the filter paper in 200PA.

Conclusion: The air volume of HEPA filter, a 900*600*370 filter 0.88*0.58*280*0.35*2*0.011*3600=3961m3/h

Where :0.88 is the effective length of filter paper;

0.58 is the effective width of filter paper; 280 is the fold number of 1 meter standard filter paper; 0.35 is the actual height of filter paper; 2 is double layer

0.011 is the wind speed of filter paper section.

Air volume type of HEPA filter: with partition HEPA filter, no partition HEPA filter, combined HEPA filter, liquid trough HEPA filter, disposable integrated/replaceable integrated HEPA filter, high humidity resistant HEPA filter, high temperature resistant HEPA filter.

High efficiency filter manufacturer Efficiency level: H10, H11, H12, H13, H14. The filter is mainly for particles above 0.3μm.