2 kilograms of air occupies ~1.63 cubic meters at sea level at 15 degrees Celsius or 59 degrees Fahrenheit.
I've used this weight to volume calculator:
http://www.aqua-calc.com/calculate/weight-to-volume/substance/airOne hour consists of 60 seconds, not to state the obvious.
Then, per one (1) hour you'll have sixty (60) times more air passed through than per one (1) second:
1.63 cubic meters of air x 60 seconds = 97.8 cubic meters of air per one (1) hour.
Finally, 2 kilograms of air per second is approximately equal to 97.8 cubic meters of air per one (1) hour.