Cleanroom Air Flow Design

Single-Pass Air Flow Cleanroom Design

Single-Pass Air Flow Cleanroom

Single-pass cleanroom systems, also referred to as 'once-through', move air through mounted HEPA filter units within a ceiling grid system. Air is drawn from an adjacent, conditioned space into the cleanroom, and then expelled from near-floor mounted grilles without recirculation. Conveniently, the air expelled from the cleanroom also improves the integrity of immediately surrounding as the cleanroom intakes and filters air outwardly.

Single pass cleanroom systems provide one of the most economical solutions for cleanroom construction. Generally, cleanroom spaces under 400 square feet allow simple recirculation of adjacent ambient air and without succumbing to the heat loads of HEPA fan filter motors, light fixtures, process equipment, air change rates, and number of personnel in the cleanroom. Therefore, single-pass system use is ideal when the control of air temperature and humidity is less critical.

If existing cooling equipment is not sufficient for temperature control, the cost of a single-pass system quickly inflates. Designing the right cleanroom, the first time, is crucial for a long-term return on investment. It is not uncommon for air temperatures within a single-pass air flow cleanroom to reach 10°F higher than ambient air with up to 85% relative humidity. This is problematic for many reasons, including the comfort of users and environmental conditions which promote the growth of fungus and microbes.

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Recirculating Air Flow Cleanroom Design

Recirculating Air Flow Cleanroom

Recirculating cleanroom systems also use fan powered HEPA filtration systems, but instead of drawing air directly from an adjacent environment, a sealed plenum prevents unfiltered bypass air from entering the cleanroom and supplies pre-conditioned air. Recirculating systems provide tighter control of temperature and humidity with more precision and efficiency.

The decision to use a recirculating versus a single pass cleanroom system is more dependent precision of temperature and humidity control than particulate levels. Because temperature and humidity levels have a direct relation, failure to properly tame moisture or ambient air temperature is unacceptable for the fabrication of moisture or ESD sensitive devices such as wafer fabs or semiconductor chip.

Negative Pressure Cleanroom Design

Negative Pressure Cleanroom

Negative pressure designs prevent contaminants from entering the surrounding area. For processes which include biohazardous, corrosive, flammable, or explosive materials negative pressure and the combination of air handers or HEPA filters exhaust expel contaminated air to a safe location. A common application for a negative pressure cleanroom is during powder filling, general clean labs, bio-hazard.

Powder Containment Cleanroom Design

Powder Containment Cleanroom

Softwall, plastic strip exteriors easily pass large bins or items between spaces. An arrangement of fan filter units, exit filters, and air handlers provide a clean zone adaptable by use or application.

Powder containment systems accommodate neutral, positive, and negative pressure cleanroom configurations. Neutral pressure powder containment designs protect the area outside lab, positive pressure protects products or devices, and negative pressure rooms protect personnel.

Purity testing, weighing, packaging, and chemical analysis applications all benefit from the use of powder containment cleanrooms. HEPA filtration modules draw chemicals away from operators with 99.9% efficiency.

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