beginning to form and that there is some entrainment e from the vent side in fig4 e the inflatable bladder or bag is connected to the output leg 02 and is beginning to fill up and the pressure is increasing in the bag or bladder it also shows that the attachment bubble is intensifying as shown in fig4 f the pressure in the bag or inflatable bladder is now at a point sufficient enough to cause some spill from the auxiliary vent sv when the pressure in the bag is at a selected level the attachment bubble begins to get pressurized and the jet is switched to output main vent leg 01 with its own attachment bubble and entrainment and output leg 02 starts to lower the pressure in the bag enough for the jet to switch back to the leg 02 and the cycle repeats thus the vents provide for optimum operation the addition and location of the vents basically doubles the pressure recovery it is possible to achieve up to 80 pressure recovery and even greater the disclosed units are achieving 65 pressure recovery since the fluidic device is always pulling air to create the massaging effect pressure recovery is very important to minimize energy usage by the system previous designs were only able to recover about 25 of the supply pressure in fig4 b some of the dimensions and preferred values to achieve the specified inflation deflation times are given in particular what has been found is that u03c6pv u03b3 u03b2 pv l and lwu control the deflation time vw u03c6sv control the inflation time vent location size control the pressure recovery in the dual bladder or bag embodiment each leg is vented referring to.