Hot Air Nozzle BGA / QFP 29,0 x 29,0 mm for WQB 4000SOPS, WQB 3000OPS and WQB 3000 The patented hot air nozzles of the WQB rework stations, coupled with digital control of the hot air temperature and its flow rate provide an even convective heating of the component. This in turn ensures repeatability of the reflow process.