The outgassing yield of several vacuum chambers under exposure to synchrotron radiation at the European Synchrotron Radiation Facility (ESRF) is given. Recently, Non-Evaporable Getter (NEG) coatings have been applied in order to reduce the pressure profile inside narrow-gap vacuum chambers, with the aim of reducing the interaction between the 6 GeV electron beam and the residual gas. Chambers made out of stainless steel, with copper coating, and extruded aluminum have been studied. Wherever possible, comparison between un-coated and NEG-coated chambers of the same geometry is made. It is shown that the NEG-coated chambers give a reduced amount of bremsstrahlung radiation, a clear indication of a reduced outgassing yield and distributed pumping. A brief description of a NEG-coating facility, capable of coating chambers up to 6 meters in length, being built and commissioned at the ESRF is given.