There are various solutions to the endings of flue, combustion and ventilation ducts. Their location is largely high altitude installations that are often difficult to access. The study presents the results of comparative tests for diffusers - exhaust gas regulators; new and after long-term use. The tests included structural and visual assessment of diffuser plates. Changes in the geometry and thickness of sheets and corrosion resistance, in the context of the nature of behavior under the influence of temperature of exhaust gases and changing weather conditions. For these reasons, appropriate tests were carried out to check the resistance during prolonged use.Keywords: Chimney, corrosion, diffuser, smog, combustion process
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