Laboratories that are large or have a complex set of apparatus require walk in fume hoods. These are special storage units in which apparatus are setup for the purpose of carrying out experiments. Contrary to the suggestion of their name, people are not allowed to walk into the hoods while an experiment is on. However, once the experiment is complete one can access the hood’s interior.
Setting Up A Walk in Fume Hood
The status and design of the floor on which the hood is to be built must be examined. Since the floor serves as the fume hood base, it should be in prime condition. Also, concerns about airflow at this level ought to be addressed professionally. The doors should be fitted in such a way that no air leaks beneath them or above them. This can be achieved through adjusting back baffle slats – by setting the upper baffle to a one-inch opening while the lower baffle is fully opened.
In the case of the sashes, they can either be horizontal or vertical. Usually, a majority of people find horizontal sashes more convenient than the vertical since they are easier to operate. Additionally, horizontal sashes are far less susceptible to room air currents as compared to vertical sashes.
The chemicals, which are to be used in the hood greatly, determine the material to be used in constructing it. This is because various compounds react differently with different building material. For instance, hydrofluoric acid attacks the glass, while stainless steel stops perchloric acid. However, most compounds with the exception of a few do not react with glass.
Furthermore, additional features such as floor drains may be included, subject to the application of the fume hood. In some cases, restrictive barriers may be necessary to prevent unauthorized access.
When in laboratories, people are expected to observe the set out safety guidelines due to the harmful nature of chemicals stored in the lab. Walk in fume hoods are not different; when one needs to use them, it serves them best to seek the assistance of a qualified laboratory technician.