Even without a pandemic air quality in rooms should be an issue. I worked with un-flued gas heaters in hot…

Even without a pandemic air quality in rooms should be an issue. I worked with un-flued gas heaters in hot stuffy rooms as a teacher, with people nodding off. Yesterday’s training hit 2500 ppm, and was still climbing when I got the door opened. https://t.co/xbjHWcFRay