Dynamic Pass box class

Why we maintain only iso 5 inside working area of Dynamic Pass box on different pressure difference , class etc. Why not it’s iso 1 ,2 , 3, 4

that depend on type of filter we are using in pass box, purpose, back ground supporting area.

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it depends on which class of air is required in specific manufacturing area , different type of air quality required in manufacturing area of microchip, drugs etc.

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