Electrical Connection
The motors are wired to an external terminal box.
Fan Performance Curves
The performance curves for these fan types have been established in mounting position B (connected on the pressure side and open on the suction side) and show the static pressure rise Dpst in reference to the volume air flow. The given dynamic pressure pd2 refers to the flange crosssectional area at the outlet side of the fan.
Sound Levels
The ascertaining of the sound level follows the enveloping surface method according to DIN 45 635 section 38. The data tables show the A-weighted sound power level LWA6, at the outlet side, unducted, in decibel figures. The A-weighted sound power level at the inlet side LWA5 according to DIN 45 635, part 38, is obtained as follows: LWA5 = LWA6 - 3 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 at respective fan. These levels has been established at 0.5 x Vmax.
The A-weighted sound pressure level LPA at a distance of 1 metre is obtained approximately by deducting 7 dB(A) from the A-weighted sound power level LWA.
It is important to note that reflexion and room characteristics as well as natural frequencies differently influence the sound pressure levels.