MKA

Application

• Sound attenuator splitters with resonating panels, Type MKA, used for the reduction of fan noise and air-regenerated noise in air conditioning systems
• Attenuation effect due to absorption and resonance
• Broadband attenuation even in the low frequency range of critical fan noise
• Hygiene tested and certified to VDI 6022
• For use in potentially explosive atmospheres (ATEX), zones 1, 2, 21 and 22 (outside)

Special characteristics

• Resonating panels ensure increased insertion loss in the frequency range of critical fan noise
• Up to 30 % lower differential pressure
• Energy efficient and/or space saving due to aerodynamically profiled frame
• Hygiene tested and certified
• Multi-section construction available for large dimensions

Nominal sizes

• H: 300, 400, 500, 600, 700, 800, 900, 1000, 1100, 1200, 1300, 1400, 1500, 1600, 1700, 1800 mm (intermediate sizes 150 – 2500 mm in increments of 1 mm)
• Height subdivided: 2501 – 5000 mm, in increments of 1 mm
• L: 500, 750, 1000, 1250, 1500 mm (intermediate sizes 501 – 2500 mm in increments of 1 mm)
• Length subdivided: 2501 – 3000 mm in increments of 1 mm
• Undivided construction: H + L 4000 mm max., H and L 1500 mm max. (if one dimension is 1500 mm, the other one must not exceed 1500 mm)

Variants

• MKA100: splitter thickness 100 mm
• MKA200: splitter thickness 200 mm
• MKA230: splitter thickness 230 mm

Construction

Surface of splitter area not covered by a resonating panel

• F: Glass fibre fabric
• L: Glass fibre fabric and additional perforated sheet metal to protect the absorption material

Parts and characteristics

• Aerodynamically profiled frame
• Absorption material and resonating panels fitted to reduce air-regenerated noise by absorption and resonance

Useful additions

• U-sheets/clamp sheets to join subdivided attenuator splitters

Construction features

• Aerodynamically profiled splitter frame (radius > 15 mm) that enables a reduction of turbulence both upstream and downstream; frame with grooves for increased rigidity
• Frame edges are folded to protect the infill
• Operating temperature up to 100 °C (construction with perforated sheet metal up to 300 °C for 8h max.)

Materials and surfaces

• Splitter frames, centre mullion and resonating panels made of galvanised sheet steel
• Absorption material is mineral wool

Mineral wool

• To EN 13501, fire rating class A1, non-combustible
• RAL quality mark RAL-GZ 388
• Biosoluble and hence hygienically safe according to the German TRGS 905 (Technical Rules for Hazardous Substances) and EU directive 97/69/EC
• Faced with glass fibre fabric as a protection against erosion through airflow velocities of up to 20 m/s
• Inert to fungal and bacterial growth

Standards and guidelines

• Insertion loss and sound power level of air-regenerated noise tested to ISO 7235
• Meets the hygiene requirements of VDI 6022, DIN 1946, parts 1 and 2 as well as of VDI 3803
• Directive 94/9/EC: Equipment and protective systems intended for use in potentially explosive atmospheres

Maintenance

• Maintenance-free as construction and materials are not subject to wear