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The open space between the conduit sleeve and the ducted pipe is filled with NOFIRNO® multi-filler sleeves type 22/15, or Type 18/12 and 27/19. For ease the filling, the NOFIRNO® filler sleeves are supplied non-split. The insertion does not have to be precise in this regard. Adjustment of the set of sleeves to the 20 mm recess can be carried out just before applying the sealant. A 20 mm thick layer of NOFIRNO® sealant is applied at each side of the conduit. Clean and dry the conduit  opening, as well as the pipe thoroughly, and remove any dirt, rust or oil residues before applying the sealant. A cloth is then used to press down the sealant layer flush with the end of the transit frame. It is of outmost  importance to ensure that the sealant is pressed very tightly so that the sealant is compressed into all empty spaces of the NOFIRNO® sleeve set, including partially into the hollow filler sleeves. The larger the adhesive  surfaces of the sealant, the higher the performance of the system.