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Drizgas - General Purpose Fume Hood
General Purpose Fume hood are used for extracting mild acidic/alkaline or solvents fumes during chemical reactions.General purpose fume hood also called as “fume cupboard” or “fume closet”. Fume hood are only source of lab ventilation. Exposure controls of laboratory include equipment and procedures designed to reduce inhalation, skin absorption, or ingestion of hazardous materials. A properly functioning and properly used fume hood can reduce or eliminate exposure to volatile liquids, explosion protection, dusts, and mists. It is desirable to use a laboratory hood when working with all hazardous substances.Fume hoods when sized with an appropriate chemical resistant centrifugal exhaust fan will protect laboratory staff from exposure to harmful fumes
Working principle of fume hood
The air is sucked from the front which is the open side of the cupboard, slots and baffles direct the air flow to the atmosphere. Air foils at bottom and side edges allows uniform air flow to the work surface with minimum turbulence.The air being exhausted is either expelled outside the building or made safe through filtration and fed back into the lab area. The recirculated air is not permitted to non-laboratory areas as they are kept isolated.So that users may be protected from hazardous fume & gases expelled during any experiment.Horizontal /vertical sash can be used for protective shielding.There is to be an adequate volume of air available or the fume-hood won’t be able to draw a sufficient volume of air to function properly.
There are two type of fume hoods
Ducted Fume Hoods: These Fume Hoods are used for industrial purpose. The air is drawn from the lab space into the fume hood and then dispersed through ducts into the outside atmosphere.
Ductless Fume Hoods: In this Fume hood the air is treated and recirculated instead of venting it directly to atmosphere. Fan is mounted on the top of the hood, or below the worktop. Air is drawn through the front opening of the hood and goes through the filter, before passing through the fan and it is recirculated back to the workplace. For a ductless fume hood, filter medium is essential to remove hazardous and noxious substances. Advantage of ductless fume hood, they are mobile, energy saving and easy to install.
- Fume hood base cabinet
- Blower
- Fan ON/OFF switch
- Ceiling enclosures
- Electrical accessories
- Light On/OFF switch
- Cleanand chemical resistant interior
- Sash stop limit and air flow monitoring system
- Optional –Sensors for activating alarm when gas leaks out of the hood.
