Bonsai 3 x 2 ft 99.99% HEPA Flowhood Fan Filter Unit (FFU) 120V

Nice performing Unit. I had one I bought on Amazon 3 years ago but cannot find replacement filters. Glad I can buy one here and know its from a company that has been in business for 10+ years.

Fast shipping and was packed well. The unit works well and it ended up being cheaper than building one.

Love this thing! So glad I bought it!

This is my 2nd FFU. The first one I bought from a different vendor for about $300 more. So this is definitely a good place to purchase one! I ordered Tuesday and received mine Friday! Well packed and protected!

In case you are confused about the difference between an FFU and a Laminar Flow hood, let me fill you in. They are very similar, but there are a few key differences and theories on how these work in our field of Mycology.

1. No laminar flow. FFU's were originally designed to make a clean room. You would install them in a wall or ceiling and this would constantly push clean air into your room. There is no box for air to build up before it is pushed through the filter, so you get air movement in all directions. Is this bad? Theory 1: NO, Theory 2: Yes. I will explain later.

2. FFU's have Adjustable speed fans: Since these are meant to clean rooms originally, they have 3 speed settings and allow you to adjust the speed of the air. Most flowhoods should be around 110-175 FPM air flow. So these can be adjusted to match the traditional air speed of the normal laminar flow hoods

3. Take up less room: Since there is no box, these have a shallow depth allowing you to place one on a standard table and still have room to work. They are Portable and easy to store when not in use.

I want to explain the one disadvantage of an FFU over a traditional Laminar Flowhood. Laminar flow is air movement in a consistent steady stream. When people design flowhoods, there are calculations on how big the box is and how powerful of a blower fan motor to use. When you match the correct two items you get perfect laminar air flow. This is great for doing microbiology work, extensive agar work and delicate tasks that require precision. For most of us we really don't need that level of clean air. FFU's send clean air in multiple directions and for basic work like grain to grain transfers, fast agar transfers, inoculations and other mycologic work the air will be clean and you should not have any issues. These units work best in smaller rooms and always make sure you run it for 30 minutes prior to using.
In my experience, large flow hoods are obviously the best tool for the job but some of us can't afford them! I have had no issues using FFu's the same way I would a flowhood for half the price.

Now, I just received this Bonsai Model which appears to be a customized version of all the other ones being sold online. It has the same specs and I really like the washable pre-filter. When I received my first FFU, the pre-filter that came with it seemed to restrict the air flow too much and I had to buy a thinner filter. This one is exactly what this units needs. Props to Bonsai for including that.

Overall, I think this unit looks and performs just like it should. I have not used it yet but I have it next to my older unit and it sounds and blows like it should! Good luck everyone and enjoy the hobby!