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# How do I tell the difference between a torsion spring and an extension spring?

**The torsion spring**
— The torsion spring is fitted ONLY on sectional doors, and is installed horizontally. Torsion springs can be "at the front" = next to the lintel; they can also be "at the back", placed at the other end of the rails.

**The extension spring**
— It's most often installed vertically but can sometimes be positioned horizontally, on either side, along the sides of the door, along the guide rails; they stretch as the door closes and relax as it opens.
Extension springs can be found on their own, but also in clusters of several springs. To identify a spring in a cluster, look for the reference engraved on the hook.

**Still not sure?**
Send us:
* An overall photo of your door closed.
* The ends of the springs.
* The door's identification plate