When it comes to laboratory safety, one of the most important pieces of equipment is the fume hood. Fume hoods are essential for protecting workers from harmful fumes, gases, and vapors that are produced during experiments and procedures. There are two main types of fume hoods: ducted and ductless. In this article, we will be focusing on ducted fume hoods and the installation process involved.
Ducted fume hoods are connected to an external ventilation system that exhausts the contaminated air outside of the building. This is in contrast to ductless fume hoods, which use filters to clean the air before recirculating it back into the laboratory. While ductless fume hoods are more energy efficient and easier to install, ducted fume hoods are the preferred choice for laboratories working with volatile and toxic chemicals.
Installing a ducted fume hood requires careful planning and execution to ensure proper functionality and safety. Here are the steps involved in ducted fume hood installation:
1. Site Selection: The first step in installing a ducted fume hood is selecting the appropriate site within the laboratory. The fume hood should be placed in an area with adequate ventilation and away from any sources of heat or contamination. It is also important to ensure that there is enough space around the fume hood for easy access and maintenance.
2. Ductwork Design: Once the site has been selected, the next step is designing the ductwork system that will connect the fume hood to the building’s ventilation system. This involves calculating the required airflow rate, duct size, and the number of turns and bends in the ductwork. The ductwork should be designed to minimize resistance and maximize airflow to ensure the fume hood operates efficiently.
3. Ductwork Installation: After the ductwork design has been finalized, the next step is installing the ductwork. This involves cutting holes in the walls or ceiling to run the ducts from the fume hood to the ventilation system. It is important to insulate the ductwork to prevent condensation and leakage, which can compromise the effectiveness of the fume hood.
4. Fume Hood Installation: Once the ductwork is in place, the fume hood can be installed. This involves mounting the hood to the wall or floor and connecting it to the ductwork using sealed connections. The fume hood should be leveled and calibrated to ensure it is operating at the correct airflow rate and face velocity.
5. Testing and Commissioning: The final step in ducted fume hood installation is testing and commissioning the system. This involves conducting airflow tests to verify that the fume hood is operating as designed and meeting safety standards. It is also important to test the alarms, sensors, and controls to ensure they are functioning properly.
In addition to the steps outlined above, there are several factors to consider when installing a ducted fume hood. These include ensuring the fume hood is compliant with relevant safety standards, such as ANSI/ASHRAE 110 and OSHA guidelines. It is also important to consider the location of the fume hood in relation to other laboratory equipment and workspaces to minimize the risk of cross-contamination.
In conclusion, ducted fume hood installation is a crucial aspect of laboratory safety and requires careful planning and execution to ensure proper functionality and protection. By following the steps outlined in this article and considering the factors mentioned, laboratories can create a safe and efficient working environment for their employees.