In layman’s terms, a fume hood is an advanced and complex piece of machinery that acts as a safety device for laboratories and other industrial sectors. Many laboratories involve operations which deal with hazardous fumes or smoke. Clearing up these pollutants and purifying the air is critical for the workers’ health and safety.
Modern laboratory fume hoods are freestanding, ductless and customized. Their primary use involves drawing out fumes from lab environments where emissions are a regular occurrence. It allows chemists, bio-chemists, and lab-technicians to work with chemical substances, bulk powders, strong gases and particulates. As fume hoods are complex and expensive pieces of machinery that have to be installed correctly, there are functional and structural aspects that you must keep in mind when installing them. Here are some of those factors listed below.
v The Size of the Fan: Fume hood manufacturers have made provisions for supplying fans of different sizes to the different models. The first factor to consider here is the size of the room which has a direct bearing on its functionality. Fumes cannot be cleared effectively if a fan is too small for the room. Similarly a fan with a blade length which is more than required for the room size may result in the discomfort of workers which will negatively affect their productivity. Thus, before purchasing a fume hood, proper attention must be paid to the size before progressing to other considerations.
v Power of the Unit: Power differs in variants of different sizes and control units. Similar to the size of the fan, the power rating of the fume hood should be compatible with the size of the room. For example, a powerful unit is most effective in industrial sectors that produce a large volume of harmful gases. One way of checking this is to check the power ratings that come along with every fume hood.
v Attaching the Hood: Fume hoods can either be fitted to a wall or ceiling in any room. Flues may extend from the fan where the gases escape. This will depend on whether you want the fumes to be pushed out of the building directly or to an exterior vent.
Fitting fans to the wall is an important aspect when workstations are fitted around the wall. Multiple fans must be fitted together in such a way that the room is effectively cleared of fumes by combining the power of each fan. Consultation with the distributors or manufacturers is important for calculating the number of fans needed to clear one room. Suppliers tend to have a large catalogue that showcases different types of fans suitable for different sectors.
v Understanding the Control Panel: Control panels for fume hoods are typically placed on walls near exits. Units can be controlled by flipping on the power switch, or by maintaining individual controls. The purpose of the control panel is to provide complete control of the fume hoods to the workers in the room and should be wired to a central control system which can shut them down directly.
The controls are pretty simple to use but consulting a user’s manual is always a good idea. Workers can keep their own workstations clean and use the fans in the most optimal manner possible. Employers should share the control dynamics with their employees to improve productivity by quite a margin.
v Supplementary Devices: One of the most important supplementary devices is the flue. Flues should be rated for use with vents or incinerators. It is important for coordinating the purchases made from the fume hood supplier and manufacturer of the incinerator, as every fan must spin at a certain rate to supply the incinerator. Incinerators are critical when dangerous fumes are produced every day in the work environment.
v Hood Filters: Hood Filters are responsible for ensuring the optimal capture of emissions from the laboratory. Normal fume hoods depend on either carbon or HEPA filters to effectively clean the air. However, there are several customized hood filters that deal with certain substances effectively. They are available in a wide range of size and functionality and should be replaced when hood efficiency levels start to show signs of decreasing.
Fume hoods are a necessary element in the normal work environment of laboratories and in the industrial sector. Almost all laboratories are required to install standard fume hoods in the workers’ interests under OSHA and EPA regulations. They must be properly installed and operated to meet the standards of a pollution-free environment. Proper disposal of fumes and dangerous gases is critical, not only for the employees’ health and safety but also for the society at large. Many companies have faced legal action for not disposing off their fumes in an effective manner, so it is definitely a point worth considering.