Hd in reference number stands for heavy duty: 20x20x1 hd.
An item designed to remove dust, or other small particles from air by ionization and precipitation. it consists of power supply pack, electric magnetic screens, ionizer section, collector section, and the like.
Classification: Dust collection and air purification equipment, nesoi
NSN 5985-01-226-3068
NSN 5975-01-508-3624
NSN 6105-00-465-7018
NSN 5975-00-147-4791
NSN 6110-01-363-3920
NSN 6240-01-557-1177
NSN 5996-01-017-1309
NSN 6685-01-150-6581
NSN 5855-00-256-5562
NSN 5945-00-840-3496
NSN 6685-01-576-9843
NSN 6620-00-643-1402