You should have this placed above your plants, as Co2 is heavier than air, therefore will fall. Is the vent fan at the top or bottom? I would hate to see you waste your time making these contraptions and then blowing any Co2 you may have created straight out of your room.
If you really want to know how much Co2 you're creating, buy one of these: http://www.co2meter.com/ Shit ain't free, but it seems like a waste of time to build little devices and have no way of knowing how much (if any) benefit you are receiving from them.
Thanks for the help, my area is small, so this should sufficeI use that same method. 20 oz bottle cup of sugar and yeast. It creates enough co2 to keep my meter reading 34 ppm for the first week but it slowly drops off over time. Little trick with this the more sugar you use the longer it produces co2. The more yeast you use the faster it creates co2. Iv used this method for fish tanks. And mj plants. Works well. Oh and keep in mind these are my numbers in my grow room. Yours very well could differ due to a lot of factors. Room size. Amount of plants. Airflow. Etc etc.
Over 9000.I have a mixture of about one cup of sugar two cups of water and a third pack of yeast. I have a grow area of about 2x3x2 and i would like to know how many ppms of co2 is produced by the mixture