IntroductionTypes of ventilation valves based on application1. Air adjustment valves2. The air -round valves3. Ceiling valve4. Wall valveThe types of valves based on materials1. Aluminum valves2. Plastic valves (PVC)3. Iron valves (galvanized)4. Wooden valves (MDF)The effect of valves on the quality of the interior airChoose the best valve with Khavaran valve manufacturing groupConclusion