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OfflineBrewtality
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Registered: 12/06/20
Posts: 18
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Re: Box fan flowhoods, Glove boxes, Positive pressure boxes and Automated Mono-Tubs [Re: ruawakeyet] * 7
    #28022118 - 10/28/22 09:19 PM (1 year, 2 months ago)

I have some data to add to this thread. Anecdotes tend to rub me the wrong way.

I am not sure of the tek responsible for proper construction of a "Blowhood", but I went to Homie Depot and picked up the finest ingredients available on the shelf. Please feel free to ridicule me for my noobness.

1 Lasko (Made in the USA) 20" box fan.
1 Honeywell 20"x20"x1" Elite Allergen Air Filter - FPR10
Roll of tape.

A quick run through the Gargler told me FPR10 is roughly equal to MERV13.

I ran a few tests using a Lighthouse Solair 3100 Particle Counter and these are the results.

This strictly evaluates the potential for contamination based on the number of particles in the air. Organisms that contaminate don't have feet, they don't walk into your plates, they ride on particulate.

The testing and method:
The samples were collected 12" from the filter face.
Each location was sampled 5 times and the results were averaged.
The sample duration was 1 minute.
The sample size was equal to 1 cubic foot of air.
All values represent particles 0.5 microns and larger.

Background Sample: Room Air Sample, no fan running (Aka Baseline)
High: 299,691
Low: 296,907
Average: 298,246 particles per cubic ft

Fan Sample: - Fan running on high with no filter
High: 284,209
Low: 260,840
Average: 270,921 particles per cubic ft

Fan with Filter: Speed setting 3 (High) with Filter attached.(Avg velocity 180 ft/min)
High: 61,895
Low: 29,653
Average: 39,734 particles per cubic ft

Fan with Filter: Speed setting 1 (Low) with filter attached. (Avg velocity 79 ft/min)
High: 20,190
Low: 18,577
Average: 19,571 particles per cubic ft

Chinese FFU Imported and marketed to the mushroom farmer: Speed Setting 3 (Average velocity 63ft/min)
High: 0
Low: 0
Average: 0 particles per cubic ft

The data above shows that using the method I have outlined the box fan filter fails to adequately reduce the particulate load when compared to a proper HEPA filter. You can decide if your time and money are worth the risks.

Additional info to consider: I attempted to use this method to test my Still Air Box. The nature of this test (vacuuming air through a tube) negates the primary function of the SAB, so I didn't include the results for comparison. Let me know if you think it should be added.


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