Fan Performance Curves
The performance curves in our catalogue have been established using the inlet test method in the test chamber according to DIN 24 163, mounting position B. The curves indicate the static pressure increase ∆ pfa as a function of the volume flow.
Sound Levels
The figures quoted in the performance curves are the “A” decibel figures which are the sound power levels LWA6 at the outlet side in duct systems. The “A” sound power level at the inlet side LWA5, according to DIN 45 635, part 38, can be calculated via the relative sound power levels (see below) or is obtained approximately as follows: LWA5 ≈ LWA6 - 6 dB
The “A” casing sound power level LWA2, according to DIN 45 635, part 38, can be calculated via the relative sound power levels (see below) or is obtained approximately as follows:
LWA2 ≈ LWA6 - 17 dB - for EKN or DKN
LWA2 ≈ LWA6 - 25 dB - for EKNS or DKNS
The “A” sound pressure level LPA at a distance of 1 metre is obtained approximately by deducting 7 dB(A) from the “A” sound power level.: LPA(1m) ≈ LWA2 - 7 dB
It is important to note that reflexion and environmental characteristic as well as natural frequencies differently influence the sound pressure levels In order to avoid structure-borne noise transfer to a connected duct system we recommend the use of flexible duct connection.
The A-weighted octave sound power level is important for the choice of suitable sound attenuators. It is obtained as follows: LWAokt = LWA6 + LWArel