Gas Flow Sensor (small, cheap, for Arduino, for DIY fume hood)?

[Leif Droms]

Does anybody know where I could find a gas flow sensor, that's preferably small, cheap, and low voltage, that I could use for the arduino?

So far, all I've found is this:
http://moderndevice.com/product/wind-sensor/

To give some background, I am attempting to DIY a fume hood for a RepRap printer I have arriving soon. Nobody wants their living room smelling like burning plastic. I need a gas flow sensor to balance the fan speed against blowing too much air against the equipment, which would cool it down and warp the new plastic print.

Thanks
Leif

[josh jordan]

How much airflow?  This line of sensors from honeywell is kind of expensive but measuring airflow is expensive.  http://www.newark.com/honeywell-s-c/awm5102vn/air-flow-sensor-0-slpm-to-10-0/dp/04M8264

Unless you implement it yourself, you could heat up a negative temperature coefficient resistor to a known temperature by regulating its voltage drop.  Then put a thermocouple a few mm away and observe the temperature drop more as more air flows.  This is how the honeywell sensor works.

If it really needs to be cheap, just put in that 12v air pump from spark fun and run it at max speed.

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[hellokomputer]

Just take a mass airflow sensor from a car in the junk yard. Calibrate it yourself with the fan. It's basically free. Forget the Honeywell and wind sensors.