How to select the Best Fume Hood?
While selecting the fume-hood exhaust system, the placement of the fume hood should be thought out carefully. Its placement can significantly affect efficiency and safety. Air turbulence can create simply by walking past the Fume Hood, causing contaminants to be pulled outside. An air diffuser directly above the fume hood, also can create air turbulence.
Airflow into the laboratory is important as the performance of a fume-hood exhaust system affects. As laboratory always maintain negative air pressure with respect to the outside, the doors, windows, or any other openings in laboratory should remain closed during operation as contaminants will be exhausted through the fume hood only.
Laboratory fume-hood exhaust system can be measured in terms of safety provided. Which allows safe removal of hazardous fumes away from the user. The air velocity in the fume hood is the key factor in achieving the safety. If the velocity is too low, the fumes can escape from hood and enter the room. If the velocity is too high, air turbulence at the sash can occur. Airflow velocities that optimize safety typically are in the range of 0.4 m/sec to 0.6 m/sec.
The supply air is always less than exhaust air to make the lab in negative pressurized which makes the hoods to clean all contamination.
What is Fume Hood?
Fume Hood is used in R & D/QC labs of Pharma & Chemical companies. Its a local ventilation equipment that is designed to limit exposure to hazardous or toxic fumes, vapors. Fume hood is typically an enclosure having five sides. The bottom is worktop. It is having movable front sash made of toughened glass. Fume hood is ducted as well as ductless.
Fume hood is a safety device for the users where they carry out their experiments. In which they use very hazardous chemicals, acids, alkalis, solvents, etc. If you provide proper product to them then only user will feel friendly with that product.