Item is two-way air flow that compensates for air expansion and contraction. Material: all metal parts aluminum, internal sleeve is self-extinguishing lexan (polycarbonate resin plastic). Wall thickness: 4 inches standard. Drilled for number 8 (4mm) screws. Round cover standard.
A device designed to allow ventilation without excessive drafts. It may consist of either a deflector or louvers, stationary or adjustable to deflect the direction of air flow. Excludes items with fans.
Classification: Machinery parts not containing electrical features, and not specified or included elsewhere in chapter 84, except ships' propellers
NSN 6110-01-436-4275
NSN 5930-00-494-7776
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NSN 6620-00-693-7751
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NSN 6685-01-433-2889
NSN 5895-01-362-5557
NSN 5910-00-518-1477
NSN 5985-00-430-9662
NSN 5925-00-529-3950