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Reactive silencers are usually only made of sheet metal or stainless steel and do not contain mineral wool, because in specific industries porous materials are avoided for hygienic reasons. However, this also creates a larger construction. The advantage is that it can be completely cleaned with disinfectants or steam cleaned. The silencers pictured here are located on the roof of a manufacturer of a nut-cocoa-spread which causes sticky particles in the exhaust air.

A true LBF strength: finding and optimising technical solutions with our customers. Together with our customer’s ideas and our network of experience, we design products, provide services and complete projects. LBF can come aboard at any stage during a project – whether the solution is almost complete or if it is still unclear exactly what product is needed. Design sketches, brainstorming, sample productions, as well as taking measurements and testing all lead to finding a solution.

Fans are used for air extraction in exhaust air systems. This generates noise. Consequently, silencers are needed in the ducts. We offer rectangular Halar-coated silencers with integrated plastic splitters. The mineral wool is sealed in foil and placed in the sections of the splitter. The splitters are secured with bolted locking strips and can be easily removed in the direction of the air flow.

LBF has a wide range of assembly experience, including in the following sectors: furnace systems, paper technologies, microchip industries, electroplating industries, CHP facilities, exhaust gas systems and air duct systems. On request, LBF will assemble, among other things, our noise protection enclosures with steel constructions, industrial silencers, ventilation towers and large spring elements. Of course LBF can also completely assemble the systems, including the parts provided to us by the customer, such as expansion joints, valves, fans and much more.

If the initial values are unknown, LBF can measure the noise levels of the sound source. These are then indicated as sound power levels or sound pressure levels, and form the basis for the evaluation of the sound propagation. In order to comply with maximum allowed values, the necessary noise protection measures are defined as: output level - required maximum allowed level = necessary attenuation! Silencers are measured according to DIN standards in our acoustic lab: transmission room equipped with a wall of speakers – duct with silencers – reverberation room!

Freestanding exhaust air tower consisting of load-bearing rectangular collector ducts with side connecting ports, inspection openings, and above that a duct silencer and an outlet tube. The exhaust air tower was placed behind a filter system and blows the cleaned exhaust air straight up and out at a minimum speed and a requested distance from the structure, thereby quickly mixing the exhaust air with the ambient air.

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