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Different types of louvres or louvres are generally used to create a connection between two environments in order to provide the possibility of air flow from one environment to another. So that in some cases when there is no fresh air injected into an environment and the negative pressure created due to the evacuation or return of air, it must be compensated through the entry of air from the adjacent environment. The use of these valves on doors, partitions or Barrier walls between two environments make communication between two spaces possible without creating a direct line of sight between them. If these valves are not used when exhausting from an environment to compensate for the exhaust flow, we may encounter a whistling sound or a strong air flow in the gaps and openings of the space (such as the gap under the doors).
The working basis of these valves is based on the pressure difference between two environments, and the air flows from the higher pressure environment to the lower pressure environment and replaces the air discharged from the low pressure space.
Padri louvres have the same use as ventilation louvres, with the difference that they are installed on the entrance door. Padri louvres, while allowing air to pass, do not allow to see inside because of the shape, especially its blades. This type of louver is used in spaces where the valve is not installed in the entire return air path and the air entering the space is so-called blocked and trapped in the space. In such a situation, problems such as stagnation and staleness of air in the room, creating positive pressure in the room, and as a result, the door is difficult to open due to the positive pressure behind it. By installing a louver in these situations, the incoming air finds a way to leave the room. The second frame of this valve makes it look the same on both sides after installing the valve on the door. It is possible to paint these types of louvres according to the customer's order and according to the color of the door.
The use of this valve is mostly in places with heavy air such as gymnasiums and gymnasiums, restrooms, bathrooms, and supply of air consumption in engine houses and generator rooms continuously, etc., and its use is also effective in the beauty of the environment. . Since this type of valve is generally installed on doors and partition walls (non-external walls), therefore one of the most important factors in choosing this type of valve is the compatibility of the depth of the valve with the depth of the wall or door on which the valve is installed. .
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