Electrical Connection
The motors are connected to an external terminal box. Euro-voltage according to DIN IEC 38 230 V, 50 Hz.
Fan Performance Curves
The performance curves of these fans have been established in mounting position B (installed on the pressure side, free suction) and indicate the static pressure increase Dpst as a function of the volume flow. The dynamic pressure pd2 refers to the flange cross-sectional area at the outlet side of the fan.
Sound Levels
The ascertaining of the sound level follows the enveloping surface method according to DIN 45635 section 38. The sound figures given in the performance curves represent the A-weighted sound power levels LWA6 in decibel at the outlet side, unducted. The A-weighted sound power level at the inlet side LWA5 according to DIN 45 635, part 38, is obtained as follows: LWA5 = LWA6 - 11 dB(A)
The octave sound power level is important for the choice of suitable sound attenuators. It is obtained as follows. LWAOkt = LWA6 + LWArel
The relative octave sound power level LWArel at octave medium frequency can be taken from the tables of the respective fan. These levels have been established at 0.5 x Vmax.
The A-weighted sound pressure level LPA at a distance of 1 metre isobtained approximately by deducting 7 dB(A) from the A-weighted sound power level LWA. It is important to note that reflexion and environmental characteristics as well as resonant frequencies influence the sound pressure levels in different ways.