FallTech FTR 60LE Leading Edge Self Retracting Lifeline (FT R Series, 60 ft) Nano Lok NRR 30 (Max Lite LPF 1) gas type h2s NRR 30 (Max Lite LPF 1) Overview Use our how to calculate NRR walkthrough to subtract that from your measured noise level and confirm you land safely below 85 dBA A leading edge rated unit like the FTR 60LE is engineered for applications where the line may be anchored at or below the dorsal D ring and can contact a sharp or abrasive edge during a fall — common on steel decking WC Safety also stocks compatible lanyards for shorter tie off and overhead applications where a leading edge SRL is not required