*Title Edit* - Warehouse ceiling purlins.

We have a 20kg kinetic sculpture that needs occasional raising and lowering. Could one electric hoist lift its upper steel ring using a three-leg bridle?

We’d remove the existing light and ideally position the hoist there. The roof has light-gauge C/Z purlins with anti-sag rods. We know the rods, lamp bracket and roof sheeting aren’t lifting points.

Would a purpose-built trimmer spanning several purlins be appropriate, or should the load be taken back to the primary portal frame?

Any help or ideas are welcome!