We usually set the fan speed to keep the temperature rise of the air passing through the system between roughly 40F-65F depending on the age and efficiency of your system. So, return air temperature may be 70F which means that the supply air measured in the furnace would be 110F to 135F.
exists and is an alternate of . Carbon dioxide is denser than air. The density of carbon dioxide is 1,977 g/L at 0 0C and standard pressure. The density of air (the so called International Standard Atmosphere) is 1,225 g/L. Carbon dioxide is denser than air. <br /> The density of carbon dioxide is 1,977 g/L at 0 0C and standard pressure. <br /> The density of air (the so called International Standard Atmosphere) is 1,225 g/L.
Carbon dioxide is a greenhouse gas. Too much carbon dioxide in the air makes Earth get warmer and warmer. When humans burn fossil fuels, like gasoline and coal, carbon dioxide is produced.This number tells how many parts of carbon dioxide there are in one million parts of air.arbon dioxide is a greenhouse gas. Too much carbon dioxide in the air makes Earth get warmer and warmer. When humans burn fossil fuels, like gasoline and coal, carbon dioxide is produced.