www.safetyandhealthmagazine.com/articles/15073-high-speed-door

High-speed door
December 20, 2016
The LiteSpeed HZ High-Speed Door has a Class II, Division 2 listing from UL, carrying a Group Code G and Temperature Code 6. The listing means it can safely operate in facilities where combustible dusts (such as flour, grain, wood, plastic or chemicals) are not normally in the air but may be present. All electrical components are enclosed in a UL Type 4X (NEMA) or DustTight enclosure.
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