DIY laminar flow hood filtration question

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SUMMARY

The discussion centers on constructing a laminar flow hood for plant tissue culturing, specifically addressing the feasibility of using two smaller HEPA filters instead of one larger filter. The participants confirm that splicing two 12"x14" filters can be effective, especially if a perforated plate is used to maintain airflow consistency. The seam between the filters, estimated at 1/4", is not expected to significantly disrupt laminar flow. Additionally, the use of a furnace pre-filter is suggested as a viable option to enhance filtration efficiency.

PREREQUISITES
  • Understanding of laminar flow principles
  • Familiarity with HEPA and MERV filter ratings
  • Knowledge of airflow dynamics in filtration systems
  • Basic skills in DIY construction and design
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  • Research the design and implementation of perforated plates in laminar flow hoods
  • Explore the specifications and installation of HEPA filters in filtration systems
  • Investigate the effectiveness of furnace pre-filters in enhancing air quality
  • Study airflow patterns and their impact on laminar flow efficiency
USEFUL FOR

This discussion is beneficial for DIY enthusiasts, horticulturists, and laboratory technicians involved in plant tissue culture who seek to optimize their laminar flow hood designs for better workspace efficiency and air filtration.

grunttruck
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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?
 
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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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