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  • COPPUS Portable Ventilators
    • Industrial Fans
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    • Frequently Asked Questions
    • Common Terms

Common Ventilation Terms

Confined Space

Large enough area to be occupied by an individual, but with limited or restricted means for entry or exit; not normally designed for continuous occupancy.

CFM

Cubic feet per minute—measurement of flow handled by a fan.

Static Pressure

Usually expressed in inches water gauge (Wg); pressure measured in a direction normal to the air flow; static pressure combined with velocity pressure equals total pressure.

Blocked Tight Static Pressure

Operating condition in which the fan outlet is completely closed, resulting in no air flow.

Free Air Delivery

Maximum airflow where static pressure across the fan is zero.

Capture Velocity

Air velocity at any point in front of the hood opening necessary to overcome opposing air currents and to capture the contaminated air at that point.

Decibel Levels

Sound data on COPPUS products are based on tests conducted with units operating at published speeds. No attachments for attenuating sound were used [dBA levels recorded at 5’ (1.5 m)].