Prefabricated foam for ducts is a one-component structural polyurethane foam specially designed for maximum efficiency with low expansion, suitable for use at temperatures up to +35°C. This foam has an excellent structure even at +5°C and offers excellent adhesion to concrete, mortar, walls, wood, polystyrene, softened PVC, baked bricks, and gutters. It is ideal for filling cracks, installing window and door frames, insulating pipeline systems, fastening insulators and protective pipes in walls, and quick installation of the roof and roof channels.