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FPAC and FPMC axial-<strong>flow</strong> <strong>fan</strong>s Page 23Correction factors for sound to connected ducting and the surroundings of free inlet installation.1470 rpm <strong>fan</strong> speed, arrangements 1 and 7Sizebbb-c080-5090-5090-6100-5100-6112-5112-6112-8125-5125-6125-8140-6140-8160-6160-8180-6180-8Soundpathkoka and kokb, dBOctave band, mid-frequency, Hz63 125 250 500 1000 2000 4000 8000duct (a) -3 -8 -6 -3 -4 -8 -13 -15inlet (b) -8 -8 -6 -3 -4 -8 -12 -12duct (a) -6 -10 -8 -3 -3 -9 -14 -17inlet (b) -10 -10 -8 -3 -3 -9 -13 -14duct (a) -4 -6 -5 -3 -4 -8 -12 -16inlet (b) -8 -6 -5 -3 -4 -8 -11 -13duct (a) -9 -12 -11 -4 -2 -9 -14 -18inlet (b) -13 -12 -11 -4 -2 -9 -13 -15duct (a) -7 -9 -6 -4 -4 -8 -12 -16inlet (b) -11 -9 -6 -4 -4 -8 -11 -13duct (a) -11 -13 -9 -5 -3 -8 -14 -18inlet (b) -14 -13 -9 -5 -3 -8 -13 -15duct (a) -10 -11 -7 -5 -3 -8 -12 -17inlet (b) -13 -11 -7 -4 -3 -8 -11 -14duct (a) -7 -10 -5 -4 -3 -9 -13 -17inlet (b) -10 -10 -5 -4 -3 -9 -12 -14duct (a) -13 -15 -8 -6 -3 -7 -13 -18inlet (b) -16 -15 -8 -6 -3 -7 -12 -15duct (a) -13 -14 -7 -6 -3 -7 -13 -17inlet (b) -16 -14 -7 -6 -3 -7 -12 -14duct (a) -8 -8 -6 -6 -4 -7 -12 -17inlet (b) -11 -8 -6 -6 -4 -7 -11 -14duct (a) -16 -15 -9 -6 -3 -7 -11 -16inlet (b) -18 -15 -9 -6 -3 -7 -10 -13duct (a) -9 -9 -8 -7 -4 -6 -10 -16inlet (b) -11 -9 -8 -7 -4 -6 -9 -13duct (a) -21 -14 -11 -7 -4 -6 -11 -18inlet (b) -22 -14 11 -7 -4 -6 -10 -15duct (a) -17 -14 -10 -8 -4 -6 -11 -16inlet (b) -18 -14 -10 -8 -4 -6 -10 -13duct (a) -22 -12 -10 -5 -4 -6 -11 -18inlet (b) -22 -12 -10 -5 -4 -6 -10 -15duct (a) -19 -16 -9 -9 -5 -4 -9 -15inlet (b) -19 -16 -9 -9 -5 -4 -8 -121470 rpm <strong>fan</strong> speed, arrangement 6Sizebbb-c080-5090-5090-6100-5100-6112-5112-6112-8125-5125-6125-8140-6140-8160-6160-8180-6180-8Soundpathkoka and kokb, dBOctave band, mid-frequency, Hz63 125 250 500 1000 2000 4000 8000duct (a) -3 -4 -2 0 -4 -8 -13 -15inlet (b) -8 -4 -2 0 -4 -8 -12 -12duct (a) -6 -6 -4 0 -3 -9 -14 -17inlet (b) -10 -6 -4 0 -3 -9 -13 -14duct (a) -4 -2 -1 0 -4 -8 -12 -16inlet (b) -8 -2 -1 0 -4 -8 -11 -13duct (a) -9 -8 -7 -1 -2 -9 -14 -18inlet (b) -13 -8 -7 -1 -2 -9 -13 -15duct (a) -7 -5 -2 -1 -4 -8 -12 -16inlet (b) -11 -5 -2 -1 -4 -8 -11 -13duct (a) -11 -9 -5 -2 -3 -8 -14 -18inlet (b) -14 -9 -5 -2 -3 -8 -13 -15duct (a) -10 -7 -3 -2 -3 -8 -12 -17inlet (b) -13 -7 -3 -2 -3 -8 -11 -14duct (a) -7 -6 -1 -1 -3 -9 -13 -17inlet (b) -10 -6 -1 -1 -3 -9 -12 -14duct (a) -13 -11 -4 -3 -3 -7 -13 -18inlet (b) -16 -11 -4 -3 -3 -7 -12 -15duct (a) -13 -10 -3 -3 -3 -7 -13 -17inlet (b) -16 -10 -3 -3 -3 -7 -12 -14duct (a) -8 -4 -2 -3 -4 -7 -12 -17inlet (b) -11 -4 -2 -3 -4 -7 -11 -14duct (a) -16 -11 -5 -3 -3 -7 -11 -16inlet (b) -18 -11 -5 -3 -3 -7 -10 -13duct (a) -9 -5 -4 -4 -4 -6 -10 -16inlet (b) -11 -5 -4 -4 -4 -6 -9 -13duct (a) -21 -12 -9 -5 -4 -6 -11 -18inlet (b) -22 -12 9 -5 -4 -6 -10 -15duct (a) -17 -12 -8 -6 -4 -6 -11 -16inlet (b) -18 -12 -8 -6 -4 -6 -10 -13duct (a) -22 -10 -8 -4 -4 -6 -11 -18inlet (b) -22 -10 -8 -4 -4 -6 -10 -15duct (a) -19 -14 -7 -8 -5 -4 -9 -15inlet (b) -19 -14 -7 -8 -5 -4 -8 -12Correction factors: for sound to the surroundings of ducted <strong>fan</strong>.The <strong>fan</strong> is ducted on both sides.kc, dBAccessories Octave band, mid-frequency, Hz kc dBA63 125 250 500 1000 2000 4000 8000 dB(A)Standard -9 -9 -9 -11 -10 -11 -10 -13 10Standard butwith acoustic -9 -11 -17 -16 -13 -13 -10 -13 13connection ducts 1)1)Quotations for acoustic connection ducts (heavy-duty rubber ductsthat help to reduce <strong>fan</strong>-generated sound) are available on request.
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