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443, GIDC Estate, Makarpura,
Vadodara - 390010, Gujarat, India.
443, GIDC Estate, Makarpura,
Vadodara - 390010, Gujarat, India.
The word ‘walk-in fume hood’ is misleading. Many of us think that a person can walk-in to this kind of fume hood and work. In fact, the hood must never be entered during the experiment or fume generation inside the enclosure so far, the safety precaution is concerned. The right word for ‘walk-in fume hood’ is ‘Floor Mounted fume hood’. In this fume hood, the floor of the room itself is used as a work surface. Then why is the name ‘walk-in’ popular? Floor mounted fume hood can be entered for setting up tall assemblies or large apparatus prior to experiment starts therefore in this context, the name ‘walk-in’ became popular.
Answer of this basic question defers person to person. Some users say that sash of the fume hood should not be open more than 450mm vertically from the work surface when others say that it should not be opened more than 300mm. The fact is, height of the person working at fume hood varies. So logically safe opening height of the sash also varies. The thumb rule is: SAFE OPENING HEIGHT (vertically) of the fume hood front fascia should be below breathing zone of the user. The hood user should never allow his head inside the running hood as this will cause contaminated air to pass through the breathing zone. Raise the sash to fully open position for set-up purpose only.