Brick and Honyton are the few of the HVLS fans to use UB to adjust verticality of the extension tube in two directions。
When the Rigid Mount be fixed on I-beam, its bottom flange in some cases were uneven in two directions, and the Clamping Plate of the Rigid Mount can only adjust one direction, which resulted in inclined Extension Tube.
The extra UB between Clamping Plate and Extension Tube can adjust the incline of both directions and ensure the verticality of the Extension Tube.
