# NBN Penetrations in Hebel Walls ### Issue Image: ![[Pasted image 20250227162119.png]] ## Issue Description: - NBN conduits must installed in Hebel walls inset into the wall as a double collar. - Cannot be face fixed unicollar. ## Actions to Prevent this Issue: - [ ] Build to verify that all NBN Conduits are installed with an inset collar rather than face fixed collar.