No, I am not confusing CO and CO2. It is a $90 CO2 Monitor
http://www.co2meter.com/products/co2...uality-monitor
And no you don't get sick from 1000 PPM of CO2
https://www.kane.co.uk/knowledge-cen...d-co2-in-rooms
I run my Skimmer Intake up into the attic, then out through the side of the house. Once I get into the wall, I go up in airline size, then once in the attic, I go up to 1-1/4 in PVC. That way I get good airflow through the long tube.