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slotted duct:The character of the products: use low halogen material, rigidity PVC, environment protecting, no pollution, no lead, no venomousn matter.The certification: UL:E306674,CE of Europe:C4M20504-1104-e-16, class of fireproofing:UL94V-0,little smoke and halogen, no firing encounter fire, good in fireproofing and insulation.Construct: be made of bottom and cover, there are thread holes in the bottom.Color: white, black, gray, and so on.Work temperature: -25degree-75degree, 85degree of standing high temperatureUsing method: fix the bottom first, put thread in it, then coverSpecialty:1,combined strongly, no taking off, smoothness of the surface, no hurting hands and mangling the thread nearby.2,hard to break, color changing, distortion under the temperature of 70 degree.3,low thread hole, easy combination, take down simply, easy wiring,solid: 4,no thread hole and airproof, dust protecting, mouse protecting, suit to construction and factory.ITEN NO.WXH16X16,2