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.

Technical specifications

MOC	CRCA 18G Epoxy powder coated
Stand	MS pipe, 18 G powder coated
Working table top	MS powder coated sheet covered with PP sheet
Exhaust system	Motor Blower assembly covered with GI sheet
Sash/ Door	Vertical folding type
Air velocity	0.5 m/s
Noise Level	65 dBA
Glass window	Two layer toughen glass 5 mm thickness Adjustable height Motor control
Make up air	Air needed to replace the air exhausted from a room by the fume hood and other ventilation devices
Face velocity	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 fittings	Electrical sockets and MCB switch
Illumination	Fluorescent lamp or UV lamp
Optional accessories	HEPA Filter Caster wheels Horizontal sash SS 314 / SS 316 MOC Temperature indicator Face Velocity Meter Airflow Indicator Audio / Visual alarm
Power supply	220 / 230 V

 

Dimensions
Model No.	CFM                         @29″	CFM                   @18″	Super structure			Worktop			Hood opening
			W (mm)	H (mm)	D (mm)	W (mm)	H (mm)	D (mm)	W (mm)	H (mm)
DGFH-90	567	354	915	1425	845	915	40	762	660	740
DGFH-120	833	521	1220	1425	845	1220	40	762	965	740
DGFH-150	1100	688	1525	1425	845	1525	40	762	1270	740
DGFH-180	1367	854	1830	1425	845	1830	40	762	1575	740
DGFH-240	1900	1188	2440	1425	845	2440	40	762	2185	740

 

Accessories

• Fume hood base cabinet
• Blower
• Fan ON/OFF switch
• Ceiling enclosures
• Electrical accessories
• Light On/OFF switch

Features 

·         Cleanand chemical resistant interior

·         Sash stop limit and air flow monitoring system

·         Optional –Sensors for activating alarm when gas leaks out of the hood.