Misc. DIY laminar flow hood filtration question

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The discussion centers on building a laminar flow hood for plant tissue culturing, specifically addressing concerns about airflow and filter configuration. The user is considering using two smaller HEPA filters instead of one larger, more expensive filter to create a spacious work area. Questions arise about whether splicing the filters would disrupt airflow, with suggestions that using a perforated plate could mitigate any issues caused by seams between filters. The user contemplates the feasibility of incorporating a furnace pre-filter and shares that the seam between the filters is expected to be about 1/4 inch. Visuals of the hood's design are also provided to aid in the discussion.
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hello everyone, i am building a laminar flow hood for plant tissue culturing and have a question regarding flow and filters. my issue is i want a decent size of work space, that isn't all cramped up. as it stands, a 12"x24" hepa or merv 17 rated filter is pretty expensive, but two 12"x14" filters are not. my question is, would the laminar flow be disrupted by splicing two filters together? assuming i find a pair of filters that have a thin enough trim/border that would make the seam marginal at best, that is, if this makes sense. thoughts?
 
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Are you going to use a perforated plate to generate the flow pattern? If so, the seam between the filters won't matter.
 
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russ_watters said:
Are you going to use a perforated plate to generate the flow pattern? If so, the seam between the filters won't mat
cheers for the reply.. the plan i was following didn't mention any perforated plates, but i suppose i could include them. would egg crate work? or even putting the hepa filters before a furnace prefilter of the same combined size?
 
Furnace pre-filter would work OK, but, how big is this seam? It may not be a big problem. And do you have a drawing of the hood?
 
russ_watters said:
Furnace pre-filter would work OK, but, how big is this seam? It may not be a big problem. And do you have a drawing of the hood?
i'm reckoning the seam will be about 1/4" max

here's a couple pictures from the plans. the first is the filter box without the filter and fan housing, the second includes those. this plan is for a 2'x4' filter, but i will be scaling it down
capture1.JPG
capture2.JPG
 
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