Motor
KBPF cabinets are equipped with voltage-controllable single-phase or three-phase motors.
Fan Performance Curves
The performance curves for these fans have been established using the inlet test method in the test chamber according to DIN 24 163, mounting position D (connected at both sides). The curves indicate the static pressure increase ∆ pst as a function of the volume flow. The dynamic pressure ∆ pd2 shown in the performance curves refers to the outlet flange crosssectional area.
Noise Levels
The figures given in the performance curves are the A-weighted sound power levels LWA6 at the outlet side in duct systems, in decibels. The Aweighted 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 by the following approximation formula: LWA5 ≈ LWA6 - 6 dB
The A-weighted sound power level radiated from the casing LWA2, according to DIN 45 635, part 38, can be calculated via the relative sound power levels (see below) or is obtained by the following approximation formula: LWA2 ≈ LWA6 - 25 dB
The A-weighted 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 characteristics as well as resonant frequencies influence the sound pressure levels in different ways. In order to avoid structure-borne noise transfer to a connected duct system we recommend the use of flexible connections.
The A-weighted octave sound power level is important for the choice of suitable sound attenuators. It is obtained as follows: LWAokt = LWA6 + LWArel