Life in the Stratosphere question


The papers we have  read from others who have attempted this  have all used air pumps to draw air over a filter.  I had purchased a computer fan rated to draw 120 CFM through the system.  Our system is constrained to 1/4 inch diameter tubing because of the diameter of the solenoid valves that seal the system until we get up there  

So my compatriots are now thinking of a funnel vice a fan and orienting the flow vertically vice horizontally in the payload.  

If my calculations are correct ( I need to double check them)  a funnel that was 4 inches at the wide end might produce in the  ball park of 120 CFM of stratospheric air dropping through the stratosphere.  Videos I have watched after PBC the payload seems to maintain a relatively straight orientation rocking back and forth some.  

There might be some problems keeping the funnel sterile but other than that, is this idea worth putting some thought into?


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