Ductless fume hoods are self-contained units that do not tie into existing ductwork or control systems. As standalone systems, they can be equipped with advanced controls, monitoring systems and alarms.
The controls and monitoring systems on ductless fume hoods are highly accurate and simple to operate. Solid state gas detectors monitor the carbon filter bed for saturation based on current chemical substance Threshold Limit Value (TLV) guidelines from the American Conference of Governmental Industrial Hygienists (ACGIH). Airflow sensors constantly monitor face velocity and provide this information in LFM to the user on the LCD monitor.
Controllers for ductless fume hoods can incorporate Main On/Off power switches, internal lighting controls, fan speed controls and even include monitoring for filter saturation, airflow and filter lifespan.
All fume hood operating parameters can be controlled and monitored, including ambient air temperature and inflow velocity at the face. Clocks and experiment timers can also be incorporated into the control panel to provide additional control of the internal operations.
Learn more about different types of ductless fume hood controllers here.
Detection and Monitoring
A variety of monitors are available for ductless fume hoods, including filter monitors and airflow monitors. If the filter becomes saturated or airflow drops below a certain level, an audible alarm sounds to alert the technician to the problem. This helps keep operators and fume hood contents safe.