Been meaning to do this; do you have a link or recommended model?[EDIT: I see you already responded with the model below - https://www.amazon.com/gp/product/B001PDGFR8/ ]

I'm very sensitive to lack of oxygen in a room. Our office is old and some days they don't run the A/C if it's not hot enough outside, and I feel like I'm suffocating and my productivity suffers.