Dust rollback over the miner can be caused by high-pressure (>100 psi), wide-angle cone sprays [Jayaraman et al. 1984]. A typical miner spray does most of its airborne dust collection in the first 12 in. Thus, top and side nozzles should be arranged for “low” reach and no overspray (Figure 4-4, A and B). Past research has shown that flat-fan sprays at a horizontal orientation with high flow and low pressure (