Rectangular double flap

louvre damper

Rectangular double louvre dampers are designed to shut off (100% tightness) a gas stream (e.g. exhaust gas) in ducts with rectangular cross-section, using a sealing air station. Depending on the size of the tandem louvre damper, a multi-flap dampers design is possible.

Rectangular double flap

When designing the control system of the louvre damper and the control system of the sealing air station based on EN 12952-13, it is possible to use the louvre damper for H&S applications in case of work carried out in the flue gas ducts.

Tandem louvre dampers may be driven by any type of actuators designed for valve drives.

Our products have very good technical parameters and perfectly fulfil their tasks of shutting off and sealing process media, guaranteeing full safety and expected results. For this reason, our tandem louvre dampers are used in applications where there is no tolerance even for the slightest leaks and the safety demands are high. The quality of our products and our experience can be fully trusted, as evidenced by the wide group of our customers, which is still growing. Our customers always return to us, appreciating very long service life of our products, resulting from their reliability and materials carefully selected by our engineers.

Our louvre dampers are the most popular in the market and our major advantages, in addition to high-end products is the quality of customer service and short delivery times. If you want perfectly performing tandem louvre dampers and a quick delivery, our company is the best possible choice. Every day we welcome new customers and our regular partners fully trust our comprehensive offer - join them.


DSM offers a wide range of all types of dampers, these including shut-off and regulating dampers as well as flow control dampers. Our products are used in power plants, combined heat and power plants, incineration plants and industrial plants where their presence and reliable operation are of high importance. Therefore, during each stage of the design, manufacture and commissioning of the installation we take every effort to ensure the best quality and the most effective operation of our shut-off dampers even in the most difficult conditions. 

Our offer includes sets of dampers (diverters), flue gas dampers, shut-off dampers, round single dampers, round double dampers, rectangular single dampers, air gate dampers, louvre dampers for air and flue gas ducts, rectangular double dampers, louvre dampers with sealing air as well as poppet type round single dampers and special design diverters. Multiple product variants offered by DSM allows you to select those best tailored to your specific applications and installations, regardless of the conditions, and the top quality of our products ensures their reliable operation for a long time. Kindly check our offer for more details about our louvre and shut-off dampers.