This paper focuses on the asymptotic stability of a class of linear systems including multiple (commensurate, uncommensurate) pointwise delays. More precisely, we shall characterize some stability, instability regions in the delays parameter-space using a frequency-domain approach. As potential applications, we shall discuss the robustness analysis in terms of delays of a fluid network approximation (see, for instance, the models proposed by Izmailov, 1995, 1996).