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Post by dToad on Jan 7, 2012 18:25:33 GMT -5
I had to buy an air purifier, as the grandchildren came today, and started thinking... Here's a quick and dirty sketch for an easy to make LFH... Mate a room air purifier with a HEPA filter to the plenum (air cavity) of your LFH. The mating surface should be lined with weather stripping. The weight of the purifier will hold it in place. Use drilled hardboard or slats with a narrow gap between them to form the inside back of the cabinet. You can also use the air purifier for its intended purpose when you don't need the LFH.
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Post by lloyd on Jan 7, 2012 20:31:43 GMT -5
I looked at the specs of the Honeywell machine. I think you would be disappointed with the results. It is very discouraging to have flasks filled with mould (I know all about this :-) ). It is quite reasonable to start off with a glove-box and PPM for TC. Then when you are inspired you can build your own LFH for about $200 or so. You can look at my website for my homemade LFH. I am a pretty uninspired carpenter, so if I can do it, probably anyone can.
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Post by dToad on Jan 7, 2012 21:21:40 GMT -5
I'll get an airflow of 2 cu ft / sec or an air velocity of 1 ft/sec with a 2 sq ft opening with this design. That can be increased with higher capacity air cleaners if required. The design of cabinet itself will be much the same, regardless of airflow. all that might need to be done is increase the number or size of openings in the back.
What I don't like about the design, is that the fan and motor are on the clean side of the filter. There's more to sterilize before using the LFH. I like that the design is relatively compact for storage. I was planning on removable internal sides for the plenum to allow for complete sterilization of the cabinet. To further accomodate sterilization, I thought to use a fiberglass gelcoat on all internal surfaces.
The LFH would be only one part of bacterial / viral control. PPM may be another.
I will start with a glove box / PPM while I consider options.
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