Download chapter 5 using your protector demonstration hood

Chapter 6: Maintaining Your Protector Demonstration Hood
Monthly (or more often as required)
• Determine the actual face velocity through the sash opening
of the hood where the average reading should be at the
specified velocity. (Use calibrated thermal anemometer or
other approved apparatus). Airflow alarms are
recommended for constant monitoring.
• Using a cloth and glass cleaner, clean the exterior surfaces
of the hood, particularly the front of the hood, to remove
any accumulated dust.
• The hood rear baffle should be checked for any blockage to
ensure that the enclosure is maintaining proper airflow.
• All weekly activities.
Annually
• Have the hood validated by a qualified certification
technician. See Validating the Hood in Chapter 3.
• All monthly activities.
Calibration and Operation of
Airflow Monitors
Guardian Jr. Airflow Monitor
The Guardian Jr. Airflow Monitor is designed to continuously
monitor airflow through hoods. This permanently installed device
provides both visual and audible alarms to alert the user of
abnormal airflow conditions. A green light on the front of the
monitor indicates normal flow conditions. When flow conditions
lower than the set point are encountered, a red light is activated
along with an audible alarm. A test button is provided at the front
of the monitor to allow the user to check the operation of the
alarm. To temporarily mute the audible alarm, press and release
the test/reset button.
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