Spring Replacement Calculator

Door & System

Door Height (ft)

Door Width (ft)

Installed springs

Replace with

Advanced

Struts to add

Tolerance − / + (IPPT)

Drum radius (in)

TPF EPT

Dead coils per spring

Selection priority

Defaults match legacy: tol −0.05 / +3.0, 1 turn/ft, drum r=2″, dead coils=0. Adjust only for edge cases/high‑lift drums/etc.