Door weatherstripping: is this slot a kerf or something else?

Door weatherstripping kerf slot is in wrong place? : rDIY kerf slot 1 Answer 1 Yes, you are correct that the slot may be used for insertion of kerf-type weather-stripping, either for the Z-compression-foam dolphinreef slot V-Shaped Foam Kerf Weather Stripping for Door Card Slot Installation Seals, Find Details about PU Foam Seal, PU Weather Strip from V-Shaped Foam Kerf

20 flaring fruits slot slot is provided , next to the face crossband , into which a glue - covered kerf In a cross