Re: [DIYbio] Question from an amateur about laminar flow hood

On 03/18/2015 06:10 AM, Hany Saad wrote:
> My question is this: Can somebody explain to me how the air flows through this system?

Before I saw the biohazard emblem on the drawing I thought:

The part the blower is attached to lets air out the duct and aims down into the flow bench area.

The flow bench space has a positive pressure due to the blower pushing air in faster than
it goes out the front and the duct. The amount of air going out the front varies all
over as the front door is raised or lowered.

The duct top part seems to be a variable outlet opening like a vent for a HVAC system,
and it has a sensor so that if the flow there drops too low, an alarm goes off, or the level of pressure there
goes to a readout of some kind.


Instead, *with* the biohazard emblem:

The part the blower is attached to only lets air out the duct. It pulls air from the slots at the back.

The flow bench space has a negative pressure due to the blower pulling air out faster than
it comes in the front. The amount of air going out the front varies all
over as the front door is raised or lowered.

The duct top part could hold another filter, and it has a sensor so that if the flow there drops too low, an alarm goes off, or
the level of pressure there goes to a readout of some kind.

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