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Step 8
The fans will automatically start and the lights inside the filtered hood will turn off. Again,
the filtered hood will stabilize and chime when ready, which should be about 30
seconds.
Step 9
In a stable filtered hood with the fan on, the anemometer will take readings for about a
minute and calculate the approximate 80 fpm (or approximate 0.4m/s) value. Once
complete, another chime will play and the Maintenance and Containment icons will shut
off.
Step 10
The last chime also signals that the entire filtered hood will then turn off.
Now that the filtered hood is off, the calibration is complete. If the settings for the fan are
ever changed, for example if the working and/or closed set point are moved, the
anemometer airflow sensor must be recalibrated again.
If receiving nuisance alarms,
adjust the calibration sash position and try again. You may need to calibrate several
times before successfully calibrating the filtered hood.
Certification
The filtered hood is designed for inflow velocity between 60 - 100 fpm (0.31
– 0.51
m/s). Lower inflow velocities are possible by raising the sash position, and higher inflow
velocities are possible by lowering the sash position. The filtered hood should be
certified at a sash position that correlates to the required inflow velocity, and using
assessment protocol according to your organization’s Chemical Hygiene Plan (OSHA,
CFR 29, 1910). In the absence of a Chemical Hygiene Plan, the Chemical Hygiene
Officer should reference ANSI/AIHA/ASSP Z9.5 for risk assessment and to establish
pass/fail criteria, and ANSI/ASHRAE 110 for certification test methodology. This should
include, but is not limited to:

Airflow Velocity Testing

Smoke Testing to assess airflow patterns and containment
Re-Certification
The filtered hood should be recertified as directed by the Chemical Hygiene Plan, but at
least annually.