MD 220719 003 Duct Blanket Fiberglass

A detailed technical diagram showing two methods for insulating ducts using fiberglass: the “Butt-Joint Method” (A) and the “Staple-Stitching Method” (B). Both methods are illustrated in three-dimensional drawings, with numbered components and labeled cross-sections indicating different parts of the insulation process. Each duct is shown with blanket insulation, hangers, and mechanical fasteners supporting the insulation on the underside. Vapor-retarder tape is used strategically over seams and penetrations to ensure an airtight seal. The diagram highlights specific areas with insets to show closer views of construction details like hangers and tape application.