Air filtration is a problem related to the mechanics of two-phase flow in porous materials which finds unlimited applications. In the aeronautical and aviation fields, air filtration at the entrance of gas turbines, compressors and engines of airports construction equipment is essential for reliability improvement. Industrial, transport and medical applications are other examples. Effective air filtration necessitates the theoretical analysis and the experimental verification. The paper presents a survey for the fundamentals and basic definitions concerning the porous media, dust-air disperse system, mechanisms and techniques of filtration with the necessary principles from fluid mechanics and other subjects. An experimental investigation of the performance of two types of filters operating on different principles was introduced for the purpose of interpretation and comparison of the characteristics of basic techniques of filtration ( surface and volume). Analysis of results and conclusions are incluled.