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.
CRCA 18G Epoxy powder coated
MS pipe, 18 G powder coated
Working table top
MS powder coated sheet covered with PP sheet
Motor Blower assembly covered with GI sheet
Vertical folding type
Two layer toughen glass
5 mm thickness
Make up air
Air needed to replace the air exhausted from a room by the fume hood and other ventilation devices
The velocity of the air passing through the work opening of the fume hood measured in the plane of the sash. Measured in feet per minute (fpm), or liters per minute
Electrical sockets and MCB switch
Fluorescent lamp or UV lamp
Face Velocity Meter
220 / 230 V
- Fume hood base cabinet
- 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.