![]() Now came the assembly, which was essentially just the building of a box. However, after several hours of looking through fans on .uk I managed to a find a beastly 12V DC fan that could handle the pressure drop and still put out enough air for our filter at around a quarter of the price of the squirrel cage blowers. It seems that most people have to resort to squirrel cage blower fans to achieve the kinds of airflow necessary despite the high pressure drop of HEPA filters. Step 2 was where the inimitable EvilMushroom666’s guide lead the way for me and helped me to arrive at the necessary specification of the fan I would have to find. Unfortunately for us Brits, it seems there are far more options in the US than in the UK for reasonably priced HEPA filters, however Jasun Filtration had the Ultima MPW78 18×24 for £100. So step 1 was to find a filter that was reasonably priced and would give a decently sized working area. In summary, you need to source a fan that is capable of blowing enough air for the size of your filter at the given amount of pressure drop (back pressure) that your filter creates. ![]() I found that this guide by EvilMushroom666 explained the maths of figuring out what fan to pair with what filter really well. ![]() While the construction side of things is therefore rather simple, the crucial aspect is actually achieving a laminar airflow by pairing a suitable fan with your chosen filter. The design that is popular and that I ended up going with (at least for mk I of the flow hood) is essentially just a box with a fan blowing in one side and the HEPA filter mounted on another side. To come up with the design I did a lot of research and ended up finding some great resources on various psychedelic mushroom growing forums, a surprisingly good resource. The idea of this build being to greatly improve the reliability of the aseptic protocols in our lab. Our cleanroom design and build specialists have experience working with customers in all kinds of industries, achieving great results time and time again.Anyone following me on twitter may have noticed I posted a few pictures of my progress during my build of a simple HEPA filter based laminar flow box (not sure if it’s actually considered a flow hood). Talk to the experts at Connect 2 Cleanrooms about your next project This includes a validation certificate for clients and auditors, giving your processes authentication and you peace of mind. Optional integrated flatscreens to show production staff assembly instructionsĮach laminar flow hood comes supplied in assembly kit form with easy to follow step by step instructions & video instructions for easy self assembly.Īlternatively, installation & validation is optional. ![]() Optional LED cleanroom lighting, to illuminate processes.Stainless steel bench (solid or perforated) to mount the cabinet.Can contain either HEPA or ULPA filters depending on the required classification.HEPA fan filter unit & pressure gauge to allow real time filter monitoring.This means that the environment will be free from any particles shed from operatives, and any particles generated from the process. In a laminar flow unit, clean air has a unidirectional down flow from the face of the fan filter unit. The accurate terms to describe these units are unidirectional airflow cabinet and down flow booth - however laminar flow cabinet or laminar flow hood are the cleanroom industry's preferred terms.Ī unidirectional down-flow of clean air ensures that only extremely clean air passes down over the process, protecting sensitive products and processes from airborne particulate. Laminar flow is where a fluid flows in one direction, with no interruptions from turbulence. Our laminar flow hood can achieve ISO class 5 conditions and suits a wide number of applications. We can also design bespoke laminar flow units, tailored to match your process. Laminar flow cabinets and laminar flow hoods are perfect for creating an ultra-clean environment within a laboratory, manufacturing area or cleanroom.
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