Iso Cleanroom Standards Air Change Rates

This post addresses air change tables and calculations in iso 2 iso 3 iso 4 and iso 5 cleanrooms with unidirectional airflow.

Iso cleanroom standards air change rates.

As defined by iso 146144 4 standards. Iso definition of cleanroom air exchange rate. A 30 percent reduction in air change rate results in a power reduction of approximately 66 percent. Air changes by cleanroom classification this table details the recommended air changes per hour for iso 14644 1 2015 cleanrooms and their associated gmp grade and federal standard.

Iso 7 zone 30 60 air changes per hour. Rooms having 60 air changes per hour will have 60 times air supply then the volume of the room. Contact clean air products for cleanroom requirements classifications today contact us for more information on cleanroom standards iso class code descriptions and clean room air changes or request a quote for an in depth price analysis today. This is one of the most common classes of cleanrooms.

Rate of air exchange is expressed as the number of air changes per unit of time and calculated by dividing the volume of air delivered in the unit of time by the volume of the cleanroom or clean zone. Iso class 8 5 60 air changes per hour with a ceiling coverage of 5 15. If the supply of the air by hvac system in one hour is equal to the volume of the room then it will be one air change per hour. As of november 29th 2001 the federal standard 209e has been replaced with iso 14644 1.

Fda recommends maintaining the minimum 20 air changes per hour for clean rooms. Iso 8 zone 15 25 air changes per hour ante room. By minimizing turbulence lower airflow may improve cleanliness. To meet requirements of a clean room as defined by federal standard 209e and newer iso standards all clean rooms must not exceed a particulate count as specified in the air cleanliness class.

Lower air change rates result in smaller fans which reduce both initial investment and construction cost. Fan power is proportional to the cube of air change rates or airflow. Averaged volume of air per unit of time to determine the air exchange rate in a cleanroom or clean zone. In an earlier post on air change rates for cleanrooms we outlined how to calculate cleanroom air exchange rates for iso 6 iso 7 and iso 8 cleanrooms.

Rate of air exchange expressed as number of air changes per unit of time and calculated by dividing the volume of air delivered in the unit of time by the volume of the cleanroom or clean zone source. The air changes per hour will vary in both rooms as described below. Within you ll find summarized approaches for determining cleanroom air change rates but not recommendations.