WHAT ARE THE MAIN FUNCTIONS OF LAMINER FLOW HOOD
A laminar flow hood is designed to remove chemical fumes and aerosols from the work area while a biosafety cabinet is designed to provide both the protection for employees as well as for the cleaning purpose. Basically these are the specialized types of laboratory equipments which have some special appeal of its own and now day’s different technologies are coming in the foreign countries which help to do the work much easier and beneficial as well. A laminar flow hood consists of a filter pad, a fan and a HEPA (High Efficiency Particulates
Air) filter. The fan sucks the air through the filter pad where dust is trapped. After that the
Profiteered air has to pass the HEPA filter where contaminating fungi, bacteria, dust etc are
Removed. Now the sterile air flows into the working (flasking) area where you can do all your
Flasking work without risk of contamination. The HEPA filter has to remove all (99,9 %) airborne material (filter class H 14
According to EN 1822)
- The HEPA filter should be big enough to have enough space available in the flasking
Area. Make sure, laminar flow hoods and biological safety cabinets are not interchangeable because they have different functions and technologies. Basically, laminar flow hoods are used to remove chemical fumes away from the work area. On the other hand, biological safety cabinets or BCS are used to provide both the clean work environment and protection for employees who can create aerosols when working with biological hazards. BCS cannot be used for working with volatile chemicals or radioactive materials. But, laminar flow hoods are rarely found in a clinical laboratory setting.
Important parameters to make sure that the hood works efficiently:
- The HEPA filter has to remove all airborne materials
- The air speed in the working area has to be about 0. 5 m/s
The two types of laminar flow hoods
Before you start building your flow hood you have to decide if you prefer a vertical or
Horizontal air flow in the flasking area. In a vertical flow the air moves from the top of the
Working area to the bottom and leaves the flasking area through holes in the base. When you
Use a flow hood with horizontal air flow the air moves from the back of the working area to
The front. Before you start flasking in your laminar flow hood you should do the following actions.
- Turn on the blower and wipe out the sterile area with an alcohol soaked piece of
- Let the blower run continuously for 30 minutes. When this time has passed repeat the
Wipe out of the sterile area with an alcohol soaked piece of kitchen paper.
- you can do it in almost every kitchen
- does not require a lot of space
- Low costs.
- Before you start building your flow hood you have to decide if you prefer a vertical or
- Horizontal air flow in the flasking area. In a vertical flow the air moves from the top of the
- Working area to the bottom and leaves the flasking area through holes in the base. When you
- use a flow hood with horizontal air flow the air moves from the back of the working area to
- The front.