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Reflective silencers for machines, plants and automotive engineering

Reflection silencers attenuate engine and exhaust noises in machines, plants and in automotive engineering (vehicles). A reflective silencer uses the reflection principle and thus reduces mainly the low sound frequencies. Inside the reflection silencer there are usually two or more chambers of different sizes.

In these chambers, incoming sound waves meet reflected sound waves. The reflection reduces the sound energy. This type of silencer is often used for engines without turbochargers or for compressed air applications. A reflective silencer must also function reliably in noise reduction in the long term under difficult weather conditions, vibrations, hot exhaust gases and extreme pressures.

Reflective silencers for machines, plants and automotive engineering

Individual reflective silencers from NovaNox®.

Thanks to our many years of expertise in exhaust technology, we develop and build individual reflective silencers for manufacturers of machinery, equipment and vehicle technology. We completely design the dimensions, structure and materials.

This enables effective use of installation space, which in turn has a positive effect on the performance of NovaNox® reflective silencers. Engine and exhaust noise are significantly reduced as a result. In addition, materials are selected that make the best possible use of the performance of NovaNox® reflective silencers.

NovaNox® reflective silencers are made of tested steel or stainless steel. Only high-quality fiberglass wool, stainless steel wool or rock wool is used for the internal insulation. We use moisture-repellent insulation materials when high condensation is to be expected in an application.

This prevents persistent condensation in the reflective silencer. As a result, the reflective silencer maintains its performance even in high moisture conditions and has a much longer service life.

Do you have questions about reflective silencers for your application? Make an appointment.

Individual reflective silencers from NovaNox®.

Manufacturing process

Manual welding
Our trained personnel reliably implement the welding expertise NovaNox® has acquired over many years as a specialist welding company. We use both automated welding processes and manual welding to manufacture our reflective silencers. The manual welding process mainly benefits custom-made products, but also small and medium-sized series due to lower costs and shorter production times. Hand-welded reflection silencers are produced on modern welding tables. Dimensional accuracy and permanent repeatability are mastered by our own fixture construction - even with high tolerance ranges.

Automated welding
Our state-of-the-art welding robots handle the automated welding process. The automated manufacturing process ensures very fast and economical production.  Therefore, it is the first choice when large quantities are to be produced in consistent quality at the lowest possible cost. The automated welding process is also the welding process with the most precise results. Therefore, even very complex reflective silencers with high tolerance requirements can be implemented.

Manufacturing process

Pipe end machining for reflective silencer

With our numerous variants of tube end machining, assembly in any installation situation becomes child's play. In addition to beads according to DIN 71550 and DIN flanges, we realize expansions and reductions according to customer requirements. If required, pipe ends are slotted or equipped with threaded connections. We also offer self-tapping screw connections or male and female couplings.

Pipe end machining for reflective silencer

Corrosion protection and finishing

Surface treatments are a way to optimize the longevity, safety and appearance of your reflective silencers. The reflective silencer gets an increased service life with a durable corrosion-free, protected and robust outer skin. It also enhances the appearance of the reflective silencers. Our own powder coating and painting facility allows surface designs in all RAL colors. Quickly and in high quality. Heat-resistant painting, galvanizing and powder coating as well as pickling and passivation provide optimum corrosion protection.

Corrosion protection and finishing

Individual reflective silencers

Frequency range

Silencer solutions for all frequency ranges


Manual and automated manufacturing


We determine parameters such as the structural strength, the fatigue strength and the material efficiency of your concept by means of FEM calculations already in the first phases of development. This gives you more security during the test phases and also after your customers have put your product into operation.

We virtually demonstrate the consequences of different force and temperature effects and electrical loads by means of linear and non-linear structural-mechanical calculations. In doing so, we see the effects of the various impact factors on the entire product or component for any - even complex - geometries before we start prototyping.

We provide the results of these calculations as evidence for technical approvals, for product liability and production releases.
NovaNox® FEM calculations are performed analytically according to general and international standards. This ensures comparable and reliable results. In detail we undertake for you

  • linear and non-linear structural mechanical calculations
  • Analysis of deformations, stiffnesses and stability
  • Consideration of natural vibrations
  • Transient structural analysis
  • Collision analyses
  • Temperature field calculation (thermal-stationary or thermal-transient)
  • CAE-supported fatigue analysis with nCode

With sound level measurements of the sound levels LAFmax, LAFmin as well as LCpeak at your site we get knowledge about the sound level distribution in the frequency range from 20 to 20,000 Hz. These measurement results form the basis for the power required for your silencer. We develop the appropriate design for it.

We then calculate the insertion loss to match the planned design. In this way, components can be adjusted if necessary so that you can later achieve the best possible sound attenuation in practice.

We would like to show you as realistic a picture as possible of series production as early as the prototype phase. That is why we work intensively with you in the development, preparation and design of the construction, the material and the production process. In this way, we achieve optimal results together and keep to your time and cost planning.

As icing on the cake, we use the results of FAI to optimize the manufacturing process for maximum efficiency and profitability. This includes shortening launch times and ensuring a successful start of production on schedule. This way, you keep your project budget in check and are on the safe side.

We take care of the entire process for you, from demand planning to logistical handling. In order to save you storage costs and production costs due to larger batch sizes, we provide you with a total of 1,200 square meters of storage space as a consignment warehouse. In addition, this optimally organized component supply for your series production ensures uninterrupted production.

You receive your reflective silencers on schedule and flexibly from the consignment warehouse as you call them off. We fully integrate your existing logistics processes. Get reflective silencers from NovaNox® relaxed throughout the year by our secure component supply. You want to know more? Talk to us!

Quality management

Welding process planning is used to select the optimum welding process for the specific requirements of your reflective silencers. The right process increases the safety and stability of your reflective silencers.

Welding process planning also decides on the welding sequence. The optimum sequence of welding processes is important for efficient manufacturing processes and a longer service life and reliable tightness of your reflective silencers.

Individual type identification helps to ensure complete traceability of your reflective silencers from manufacture to the last use. Every situation along the entire product life can thus be traced in detail for your additional safety.

Depending on the material and load of your reflective silencers, various methods of type marking are available:

  • Laser engraving
  • Welded metal tags with laser engraving
  • Self-adhesive metal plates with laser engraving
  • Self-adhesive plastic plates with specific imprint and silicone coating for external protection

You get your individual labeling consisting of symbols, numbers or letters for an uninterrupted traceability of your reflective silencers. In this way, paths and processes can be optimally integrated and clearly tracked.

Part of our quality management is leak testing. This means that you can be sure that your reflective silencers will remain absolutely leak-proof even in long-term use and under extreme conditions. For your additional security, we will gladly provide you with a written certificate of conformity for the leak test for each delivery. You can easily add this NovaNox® test certificate to your overall documentation. We carry out these leak tests for you:

  • In compliance with ECE R34 or 70/21/EEC regulation, we perform a 100% test with air underwater in our dedicated test basin
  • Pressure test
  • Leak test by means of red or fluorescent dyes
  • Ultrasonic testing

Precise documentation of production processes is the basis for quality assurance in production. It ensures the high quality of your products.  Complete documentation also allows significant cost savings, especially in large projects, because defects and quality deviations can be detected and eliminated at an early stage. With precisely documented, reproducible production processes, you gain additional time and personnel resources. We offer you this detailed documentation for quality management:

  • Initial sample inspection report according to VDA 2, EN 9102
  • Factory certificates 3.1 and 2.2 according to EN 10204
  • Dimensional report by 3D measuring technique (Faro measuring arm)
  • Declaration of conformity for pressure tests

All our certificates can be quickly and conveniently integrated into your overall documentation.

Talk to our experts about the realization of your specific requirements for reflective silencers for your application!