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.
Nitrogen gas is less dense than air. Nitrogen is lighter than air because it has a lower density than air. The density of #N_2# gas at STP is #1.2056 kg/m^3#, and the density of air at STP is #1.293 kg/m^3#. So, there is less mass of #N_2# per cubic meter, and a greater mass of air per cubic meter.