I have just started making my plasma table, got past the point of no return and realised I may have a problem

I have a steel reinforced, 15mm, T5 belt to drive the torch along the gantry and to protect it from the dust I put the top run of the belt inside the hollow gantry and ran the bottom close below it.

Have I made a dust conveyor belt that will pump dust up inside the gantry or can I expect enough vibration on the belt to shake it off before it reaches the pulleys?