DIY laminar flow hood filtration question

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Discussion Overview

The discussion revolves around the construction of a laminar flow hood for plant tissue culturing, specifically focusing on the filtration system and the implications of using multiple filters. Participants explore the effects of splicing two filters together and the potential impact on airflow and filtration efficiency.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant questions whether splicing two smaller filters together would disrupt laminar flow, considering the size and border of the filters.
  • Another participant suggests that using a perforated plate could mitigate concerns about the seam between the filters.
  • A participant inquires about the effectiveness of using an egg crate or a furnace pre-filter in conjunction with the HEPA filters.
  • Concerns are raised about the size of the seam between the filters, with one participant estimating it to be about 1/4".
  • Participants request visual aids, such as drawings or pictures of the hood design, to better understand the setup.

Areas of Agreement / Disagreement

There is no clear consensus on whether splicing the filters will significantly affect the laminar flow, and multiple viewpoints regarding the use of additional components like perforated plates and pre-filters are presented.

Contextual Notes

Participants have not fully resolved the implications of the seam size on airflow, and there are uncertainties regarding the effectiveness of different configurations and components in the filtration system.

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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