No worries.
Great choice in fan by the way.
I've used the
RVK125E2-A1 280m3/h
RVK150E2-A1 480m3/h
RVK150E2-L1 660m3/h
They are bomb proof.
Make sure when you get any downtime that you remove the screw from around the centre section of the fan housing and brush out the blades etc with something like a paintbrush.
Just good maintainence and good practice to keep them running sweet.
J