The hot-air welding technique utilizes clean hot air to preheat the duct material and PVC welding rod, while pressure is applied to the weld area as the rod is guided. This joining method results in the surface molecules of the parts being joined to fuse together at the weld seam. Only welding rod produced from the same virgin PVC material (Cell Classification 12454 per ASTM D1784) is recommended for this joining process to ensure the highest system integrity. Personnel adequately trained in the art of hot-air welding thermoplastics should conduct all welding.
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