Reading a car mass air flow, volumetric air flow meter I'm looking to build an air flow meter that will output in standard liters per minute. The cheapest sensors seems to be a car's Mass Air Flow sensor. I'm wondering if there is a way use  one of these MAF to measure air flow in liters per minute.

Essentially I need to measure a medical ventilator's air flow in order to calibrate it. The gas flow analyzers that are normally used are way too expensive and offer too many extra features that I don't need. 

Thank You
There's no reason that an MAF couldn't be used with an Arduino.  It's likely that the sensor will run on 12v and output an analog voltage from 0 - 12, so you might need to use a voltage divider with the Arduino.

See this Sparkfun article on implementing a voltage divider to scale down the 0-12 volt signal to 0-5v for the Arduino.