美國國家標準 AMCA/ANSI 204-96:
Balance Quality Grades:
Seismic Vibration Limits for Tests Conducted in the Factory:
** Values shown are peak velocity, mm/s. Filter-In, at factory test speed
Seismic Vibration Limits for Tests Conducted In-Suit:
** Values shown are peak velocity, mm/s. Filter-Out.
*** Note1:Shutdown levels for fans in Fan Application Grades BV-1 and BV-2 must be established based on historical data.
Vibration Quality Grades of Fans: