When the outdoor air damper increases the flow of fresh air, which of the following is true?
a) The return air damper throttles up to reduce the volume of recirculated air.
b) The return air damper throttles up to increase the volume of returned air.
c) The return air damper is not affected.
d) The return air damper throttles down to reduce the volume of returned air.
e) The return air damper throttles up to increase the volume of returned air.
Answer: D