HP LaserJet 4250 - Manual (Page 246)

Acoustic emissions
Sound power and pressure level 1 (HP LaserJet 4250 or 4350 series)
Sound power level Declared per ISO 9296
Printing 2 (HP LaserJet 4250) L
WAd
= 6.9 Bels (A) [69 dB(A)]
Printing 2 (HP LaserJet 4350) L
WAd
= 7.1 Bels (A) [71 dB(A)]
Ready (HP LaserJet 4250) L
WAd
= 4.0 Bels (A) [40 dB(A)]
Ready (HP LaserJet 4350) L
WAd
= 3.8 Bels (A) [38 dB(A)]
Sound pressure level Declared per ISO 9296
Printing 2 (HP LaserJet 4250) L
pAm
= 62 dB (A)
Printing 2 (HP LaserJet 4350) L
pAm
= 64 dB (A)
Ready (HP LaserJet 4250) L
pAm
= 26 dB (A)
Ready (HP LaserJet 4350) L
pAm
= 26 dB (A)
1 Values subject to change. See http://www.hp.com/support/lj4250 or http://www.hp.com/
support/lj4350 for current information.
2 HP LaserJet 4250 speed is 43 ppm A4 size. HP LaserJet 4350 speed is 52 ppm A4 size.
3 Configuration tested (HP LaserJet 4250): Base printer, simplex printing with A4 paper size.
4 Configuration tested (HP LaserJet 4350): Base printer, simplex printing with A4 paper size.
234 Appendix C Specifications ENWW