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NEEDLE THREAD
Term used to describe that thread which is fed into the sewing process by the needle.

NEGATIVE PRESSURE BAGHOUSE
A system where the fan is located after the baghouse on the clean airside, pulling air through the system.

NOMEX®
Felt fiber used primarily in a high heat environment. Can be singed.

NULL
The period during the cleaning sequence in which neither cleaning nor on-line filtering is occurring causing a static environment to allow dust to drop into hopper or discharge area.