General Information
Application
- Splitter sound attenuators used for the reduction of fan noise and air-regenerated noise in ventilation and air conditioning systems
- Attenuation effect due to absorption and resonance
- Broadband attenuation even in the low frequency range of critical fan noise
- For use in areas with potentially explosive atmospheres (EC Directive 2014/34/EU (ATEX)), zones 1, 2, 21 and 22 (outside) according to Directive 1999/92/EC
Special characteristics
- Resonating panels ensure increased insertion loss in the frequency range of critical fan noise
- Leakage class C and pressure class 2 according to EN 15727
- Energy savings due to aerodynamically formed splitter frame
- Up to 30 % lower differential pressure
- Hygiene tested and compliant with VDI 6022
- Multi-section construction available for large dimensions
Nominal sizes
- Width B: 8, 16, 24, 31, 39, 47, 55, 63, 71, 79, 87, 94 in
- Intermediate sizes: in increments of 0.04 in
- Splitter thickness 4 in: 6 – 94 in
- Splitter thickness 8 in: 10 – 94 in
- Splitter thickness 9 in: 11 – 94 in
- Sizes from 95 – 189 in are available with the width subdivided in increments of 0.04 in
- Even no. of splitters: centre division
- Odd no. of splitters: off-centre division
- Intermediate sizes: in increments of 0.04 in
- Height H: 12, 16, 20, 24, 28, 31, 35, 39, 43, 47, 51, 55, 59, 63, 67, 71 in
- Intermediate sizes 6 – 71 in in increments of 0.04 in
- Sizes from 71 – 142 in are available with the height subdivided in increments of 0.04 in
- Centre division
- Length L: 20, 30, 39, 49, 59 in
- Intermediate sizes 20 – 59 in in increments of 0.04 in
- Sizes from 59 – 118 in are available with the length subdivided in increments of 0.04 in
- Part L1: 39, 49, 59 in
- Part L2: at least 20 in and ≤ L1, in increments of 0.04 in
- Width and/or height subdivided if B + H > 165 in
- Airway width S
- Minimum: splitter thickness T × 0.25, but not < 2 in
- Maximum: splitter thickness T × 2
Variants
- MS with splitter type MK
- Splitter thickness 4 in
- Splitter thickness 8 in
- Splitter thickness 9 in
Construction
Duct
- No entry: with duct
- OL: without duct (set of MK splitters only)
Splitter surface
- F: Glass fibre fabric
- L: Glass fibre fabric faced with expanded metal cover for additional mechanical protection of the sound absorbing material
- Stainless steel construction with perforated metal facing
Materials and surfaces
- No entry: galvanised steel 1.0917
- A2: Stainless steel 1.4301
- P1: splitters powder-coated RAL 7001, silver grey
Air duct connection
- No entry: without air duct profile (set of splitters only)
- P: air duct profile 1 in, galvanised steel or stainless steel
- W: angle section frame 1 × 1 × 0.1 in, galvanised steel
- T: air duct profile 1 in, galvanised steel
Matching frame
- No entry: none
- G: matching frame (only for angle section frame, W)
Parts and characteristics
- Duct
- Leakage class C and pressure class 2 according to EN 15727
- Various duct connections available
Matching frame
- Angle section frame with the same pattern as the requested sound attenuator
- For installation onto a duct (duct by others)
- Aerodynamically formed frame
- Covers the edges of the sound absorbing material
- Reduces the pressure loss
- Helps to optimise the airflow, hence reducing the air-regenerated noise
- Increased rigidity due to special profile
- Absorption material
- Resonating panel
Construction features
- Bent duct with grooves for increased rigidity
- Sound attenuators with angle section frame, width or height subdivided
- Galvanised construction only
- Aerodynamically formed splitter frame (bullnose radius 1 in) that helps to reduce turbulence on both the upstream and downstream sides; frame with grooves for increased rigidity
- Frame edges with bullnose for increased rigidity
- Operating temperature up to 212 °F; variant L up to 572 °F for 8h max.
Material and surfaces
- Duct, flange in galvanised sheet steel 1.0917 or stainless steel 1.4301
- Angle section frame in galvanised L steel S235JRC2
- Splitter frame, centre mullion and resonating panels made of galvanised sheet steel 1.0917 or stainless steel 1.4301
- Expanded metal cover made of galvanised steel 1.0917
- Perforated metal facing made of stainless steel 1.4301
- Sound absorbing material mineral wool
- According to EN 13501, fire rating class A1, non-combustible
- RAL quality mark RAL-GZ 388
- Non-hazardous thanks to high biosolubility according to the German Ordinance on Hazardous Substances and Note Q of the European Regulation (EC) No. 1272/2008
- Faced with glass fibre fabric, as a protection against erosion from airflow velocities of up to 3937 fpm
- Inert to fungal and bacterial growth according to EN 846
Standards and guidelines
- Insertion loss and sound power of air-regenerated noise tested according to ISO 7235
- Meets the hygiene requirements of VDI 6022, VDI 3803 Part 1 and DIN 1946 Part 4
- EC Directive 2014/34/EC (ATEX): Equipment and protective systems intended for use in areas with potentially explosive atmospheres
- EC Directive 1999/92/EC (ATEX): Improvement of the safety and health protection of workers potentially at risk from explosive atmospheres
- Leakage class and pressure class according to EN 15727
Maintenance
- Low-maintenance as construction and materials are not subject to wear
- Regular cleaning intervals according to VDI6022
