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O

OEM

Original Equipment Manufacturer.

OPACITY

The visual density of stack emissions.

OPEN SEAM

A missed seam; a gap in the seam caused by a run off or skipped stitch.

OUTSIDE COLLECTOR

Particles collected on the outside of the filter. (Pulse-jet/plenum pulse baghouses and some reverse air).

OVERLAP

In a lap seam, putting too much fabric in the top or bottom causing a large distance between the last row of stitches and the edge of the fabric.

OVERLOCK

Term used to describe a surge type seam. A wrapping of thread around the ends of two pieces of fabric in which both ends of fabric are facing in the same direction.