Clean Spaces

Technical share info

Terminology

Clean room:

A specially constructed enclosed area environmentally controlled with respect to air-borne particulates, temperature, humidity, air pressure, air flow patterns, air motion, and lighting.

Critical surface:

The surface of the work part to be protected from particulates contamination.

Work station:

An open or enclosed work surface with direct air supply.

Design conditions:

The environmental conditions for which the clean space is designed.

Operational conditions:

The environmental conditions which must be maintained in the operation of a clean space.

Particle size:

The maximum linear dimension of diameter of a particles.

Laminar air flow:

Air flow in parallel flow lines with uniform velocity and minimum eddies

Laminar flow clean room:

A clean room with a requirement for laminar air flow.

Conventional flow (non laminar flow) clean room:

A clean room with no requirements for uniform air flow patterns and air velocities.

Laminar air flow work station:

A work station with laminar air flow through the work area.

Non laminar flow works station:

A work station with no requirements for uniform air flow patterns and air velocities.

High Efficiency Particulate Air (HEPA) filter:

A filter with an efficiency in excess of 99.97% for 0.3 micrometre particles, as determined by Dioctyl Phthalate (DOP) test, according to military specification MIL-STD-282.

Primary air:

Air recirculating through HEPA filters pro ducting laminar flow.

Secondary air:

That portion of the primary air circulated through the air-conditioning equipment.

Makeup air:

air introduced to the secondary air system, for ventilation and pressurization.

Class 100,000:

Particle count not to exceed 3,530,000 particles per cubic meter (100,000 per cubic ft.) of a size 0.5μm and larger, or 24,700 particles per meter cubic (700 particles per cubic ft) of a size 0.5μm and larger.

Class 10,000:

Particle count not to exceed 353,000 particles per cubic meter (10,000 per cubic ft.) of a size 0.5μm and larger, or 2,295 particles per meter cubic (65 particles per cubic ft) of a size 0.5μm and larger.

Class 100:

Particle count not to exceed 3,500 particles per cubic meter (100 per cubic ft.) of a size 0.5μm and larger, or 24,700 particles per meter cubic (700 particles per cubic ft) of a size 0.5μm and larger.

First Air:

The air with issues directly from the HEPA filters before it passes over any work location.

First work location:

The location in the path of the first air stream.

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