The patented FXR rotules series swivel fittings have been tested and certified by the Darmstadt University of Technology's Institute of Structural Analysis as well as by the French government Institute of Building : CSTB. The SADEV rotules have been approved by the CSTB and are certified with an "Avis Technique" The rotule fittings are designed to limit the stress around the drilled glass hole under wind pressure.

The FXV fittings are designed specifically for interior and small external applications where wind loads and deflection is not a factor.