10 June 2015Enclosures, Racks, Cabinets & Panel Products
Since its introduction in 2014, ebm-papst’s FlowGrid has been helping ensure that high-performance cooling is not accompanied by high noise levels.
Previously available only for larger axial and centrifugal fans up to size 990, the product has now been adapted for smaller centrifugal fans with sizes from diameter 190 to 250 mm.
Noise and additional sounds arise when the inlet flow to a fan is disturbed, for example due to a narrow installation situation. This leads to air vortexes, also known as vortex string formations that create noise. The FlowGrid air inlet grille counters this by evening out these turbulences and dividing them into small portions before they hit the blades of the impeller. The grille on the intake side reduces the noise emissions and minimises disturbing individual frequencies. These narrowband tonal noises, often referred to as propeller noise or blade passing noise, are drastically reduced.
In a size 190 centrifugal fan fitted in a ventilation unit, the intake-side sound power level can be reduced by over 2 dB(A) and the blade passing noise by 15 dB, simply by using an air inlet grille. Using these grilles can help to reduce or even avoid entirely the use of cost-intensive, passive noise reduction measures.
Unlike the larger FlowGrid grilles, the smaller sizes of 190 to 250 are centrally locked, thus combining optimum air conduction with contact protection as per DIN EN ISO 13857 ‘Safety of machinery – Safety distances to prevent hazard zones being reached by upper and lower limbs’. Thus, it removes the need for an additional guard grille, which would negatively affect the intake flow. The grille is made from robust compound material and is also available in the 5VA material quality as per the UL94 flammability class.
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