Electrical Connection
The motors are connected to an external terminal box in protection class IP44.
Fan Performance Curves
The performance curves for these fans have been esatblished in mounting position A (free inlet, free outlet) and indicate the static pressure increase Δpfa as a function of the volume flow (measured with inlet cone and without protection guards).
Noise Levels
The fan curve gives the A-weighted sound power level LWA6 on the outlet side in decibel. The A-weighted sound power level at the inlet side LWA5 is identical to LWA6. The A-weighted sound power level radiated from the casing (LWA2) according to DIN 45 635, part 38, is obtained approximately as follows: LWA2 ≈ LWA6 - 8 dB (for AER or ADR).
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: 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.
The A-weighted octave sound power level is important for the choice of suitable sound attenuators. It is obtained as follows: LWAokt = LWA6 + LWArel