The felt pass-through is used for bitumen roofings with Vilpe -pipes, -roof fans and aerial sleeves. It is installed between two membranes. The width of the flange is 150 mm.(When the pass-through have to be installed afterwards the right pass-through is Classic pass-through, not felt pass-through.)
The standard colours of Vilpe pass-throughs are black, brown, green, grey, red and brick red.