... halogen, no firing encounter fire, good in fireproofing and insulatio Wiring Duct RoHSMaterial:Made from hard PVC, low halogen material, rigidity ... , 85degree of standing high temperature Struction: Made up of duct bottom and lidFeature: be made of bottom and cover, ... ,low thread hole, easy combination, take down simply, easy wiring,4,no thread hole and airproof, dust protecting, mouse protecting ...