This paper reviews data on the compatibility of nasalization with manner and voicing features. First, it addresses the relations between nasalization and manner features and discusses the scales of nasalization spreading in the light of aerodynamic and acoustic factors. Second, it examines the interdependent relations between voicing and nasality. These observations lead to propose disfavoured sequences involving nasals. The paper argues that aerodynamic and acoustic interactions between features determine their likelihood to combine within segments and when segments follow each other.