Ambient air is pulled through the perforations located towards the work zone front to prevent contamination of the work surface and work product. The inflow does not mix with the clean air within the cabinet work zone. Inflow air travels through a return path toward the common air plenum (blower plenum) at the top of the cabinet.

Approximately 35% of the air in the common plenum is exhausted through the ULPA filter to the room. The remaining 65% of the air is passed through the downflow ULPA filter and into the work area as a vertical laminar flow air stream bathing the work surface in clean air.

The uniform, non-turbulent air stream protects against cross contamination within and throughout the work area.

Near the work surface, the downflow air stream splits with a portion moving toward the front air grille, and the remainder moving to the rear air grille. A small portion of the ULPA filtered downflow enters the intake perforations at the side capture zones at a higher velocity (small blue arrows)

A combination of inflow and downflow air streams forms an air barrier that prevents contaminated room air from entering the work zone, and prevents work surface emissions from escaping the work zone.

Air returns to the common air plenum where the 35% exhaust and 65% recirculation process is continued.

Esco cabinets use German made ebm-papst® permanently lubricated, centrifugalmotor/ blowers with external rotor designs.

Integrated blades narrow the profile and eliminate need for a motor shaft.

Motors are selected for energy efficiency, compact design, and flat profile. The completely integrated assembly optimizes motor cooling.

All rotating parts are unitized and balanced for smooth, quiet, vibration-free operation.