... systemsStandard:ROHSPlace of origin:Zhejiang China(mainland) Materials:semi-regid aluminum, high flexibility and axial compressibility, 0.11mm thickness or ... Detail:20-30days after receiving the depositSpecification:semi rigid flexible duct1,Struction -soft aluminum foil2,Normal thickness -0.08mm 0.10mm, ... ,cooling,exhaust and air conditioning heating system. Semi-Rigid aluminum Flexible Air Ducting