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  • slot demo slot demo slot demo WARTA INDONESIA WARTA INDONESIA
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    Model selection

    Model selection

    Model selection

    About cleanliness class

    Cleanliness classes of clean rooms are defined by the conventionally used FED standard and the international standard ISO14644-1
    as specified below.

    FED-STD-209D

    Class 1 10 100 1,000 10,000 100,000
    Ventilation frequency - - 250 - 400 150 75 20
    Particle concentration (pcs/CFT) 1 10 100 1,000 10,000 100,000
    Metric equivalent (pcs/CBM) 35 353 3,530 35,300 353,000 3,530,000
    ISO class equivalent 3 4 5 6 7 8
    Examples of site - - LCD/IC
    Precision industry
    Surgery room Pharmaceutical
    factory
    PC assembly
    plant
    • Ventilation frequency : This shows the required number of air changes per hour.
    • Number of particles : This shows the maximum allowable number of particles larger than 0.5μm per 1 CFT.

    ISO-14644-1

    Class 0.1µm 0.2µm 0.3µm 0.5µm 1µm 5µm
    ISO1 10 2        
    ISO2 100 24 10 4    
    ISO3 1,000 237 102 35 8  
    ISO4 10,000 2,370 1,020 352 83  
    ISO5 100,000 23,700 10,200 3,520 832 29
    ISO6 1,000,000 237,000 102,000 35,200 8,320 293
    ISO7       3,520,000 83,200 2,930
    ISO8       35,200,000 832,000 29,300
    ISO9         8,320,000 293,000

    Formula for model selection

    機種選定方法

     

    Example of model selection

    When the space dimension is W2xD2xH2m and the cleanliness class 10,000 is desired to be maintained.

    1. Calculate the cubic volume of the space.
      2m×2m×2m = 8CBM
    2. Calculate the required air volume from the ventilation rate.
      75 times/h×8CBM = 600CBM/h
    3. Calculate the air volume per minute.
      600CBM/h÷60min = 10CBM/min →  Required air volume is 10CBM/min

    機種選定例

     

    Model OFU-102H-AW OFU-105H-AW OFU-110H-AW OFU-117H-AW
    Max. air volume 2m3 /min 5m3 /min 10m3 /min 17m3/min
    → Recommended model is OFU-110H-AW


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