ISO classes for Cleanrooms

Cleanrooms and related controlled environments are designed to manage airborne contamination to levels suitable for activities sensitive to such contamination. Industries that benefit from this level of control include aerospace, microelectronics, pharmaceuticals, medical devices, healthcare, and food production.

This section of ISO 14644 outlines the testing methods that can be employed to characterize a cleanroom, as detailed in other sections of ISO 14644.

NOTE: Not all testing procedures for cleanroom parameters are included in this section of ISO 14644. Additional procedures and equipment for characterizing other relevant parameters in cleanrooms and clean zones tailored for specific products or processes are addressed in other documents produced by ISO/TC 209. Examples include procedures for controlling and measuring viable materials (ISO 14698), assessing cleanroom functionality (ISO 14644-4), and testing separations.

ISO Clean room classification based on Particle concentration per meter cube:

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How to control Temperature and Humidity in Air Handling Unit

How to control Temperature and Humidity in Air Handling Unit Overview Air Handling unit is a system used to supply temperature and Humidity controlled filtered air to the cleanroom. For air filtration various types of filters are used in AHU. And for temperature and Humidity controlling cooling and heating coils are provided in AHU. Goals Control the temperature of air used in the cleanroom Control the humidity of air used in cleanroom Air filters Specifications The air Handling unit consists of Air filter Cooling coil Heating coil Air blower HEPA Filter Controlling of Temperature and Humidity By Cooling Method The cooling coil recirculates the chilled water having temperatures between 4°C to 6°C. This chilled water comes from the Chiller through centrifugal pumps. When we start the Air Handling unit blowers sucks the air through the pre filters of the air Handling unit. When blowers sucks air, it passes through the cooling co...

AIR FLOW, AIR VELOCITY, ACPH, AHU CAPACITY

Air Changes per Hour AIR VELOCITY AND ACPH OF ROOM OR AREA Procedure to be followed: Air Velocity Measurement and Calculation of Air Changes: Objective : To demonstrate that the air system is balanced and capable of delivering air velocities and providing number of air changes per hour in the respective rooms as per requirement. Equipment to be used: Hotwire Anemometer or capture Hood Pre Requisite: Air Volumes through supply and return grills and filters should be adjusted as per the design requirement of Air Change Rate and Differential Pressure. Test Method : Ensure that the Supply blower of the AHU is "ON" prior to the start of the observations. For compliance of air change rate, velocity to be measured at 5 different locations to below the each terminal or Grill (Four Corners and center) with the help of calibrated Anemometer. Calculate the average velocity of the air coming from Plenum HEPA filter / supply air grill. Calculate the air...

Chiller Approach Temperature

Chiller Approach Chiller Approach is a essential check point for ensuring that the chiller is a running at peak efficiency.When the chiller condenser approach temperature is within operating range,it indicate the condenser tubes are clean and chiller runs efficient.When increased approach temperature reduces the efficiency and it need maintenance. What is Approach Temperature? Chiller Approach temperature is the temperature difference between the liquid refrigerant temperature that leaving the condenser and the leaving cooling water temperature.This temperature difference is called chiller approach temperature. Effects of Approach Temperature:- If the Condenser approach temperature is within the operating range that indicate the condenser coils are in good condition and cleaned.In this condition chiller runs efficiently. If the condenser approach temperature is out of the operating range that indicate the condenser coil scaled from inner side due to which heat transfer not d...

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