The boot or box below the register was steel, but I decided to stick my flashlight and camera in. The duct itself looks like some kind of rolled masonite or similar. The flakes on the transition between the box and the duct look like asbestos, but the coating on the inside of the duct itself doesn’t really look like the normal asbestos roll paper stuff I’m used to seeing, or the cemen
Afternoon, Tom. Hope to find you well and in good sprit’s today.
Questions: What is the ductwork for? What do you mean by boot? Does the HVAC ventilation pass through concrete? Typically that involves embedding galvanized steel, rigid, or semi-rigid ducts directly into slab-on-grade floors.
My best guess would be that a rigid sleeve, like a slightly smaller sonotube, was placed into the galvanised steel cylinder to maintain the shape while concrete was poured. The sonotube got wet and could not be totally removed.
Early rolled fiberboard and masonry-style ducting (often called duct board) emerged as a rigid, resin-bonded fibrous glass material used to build HVAC ducts that inherently provide both air passage and insulation. Commonly used for over 50 years, this material consists of a thick, compressed glass fiber board with a foil-scrim-kraft (FSK) vapor barrier on the outside. [1, 2, 3]
Evening, Marcel.
Mistaken. its my hypothese. If it verified on Google, so be it but that is my thinking.
I thought the MB was to be used professionally? No slandering.
