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Possible Answers:
ELEVENTH.
Last seen on: L.A. Times Daily Crossword – Oct 16 2022
Random information on the term “__ hour”:
Air changes per hour, abbreviated ACPH or ACH, or air change rate is the number of times that the total air volume in a room or space is completely removed and replaced in an hour. If the air in the space is either uniform or perfectly mixed, air changes per hour is a measure of how many times the air within a defined space is replaced each hour.
In many air distribution arrangements, air is neither uniform nor perfectly mixed. The actual percentage of an enclosure’s air which is exchanged in a period depends on the airflow efficiency of the enclosure and the methods used to ventilate it. The actual amount of air changed in a well mixed ventilation scenario will be 63.2% after 1 hour and 1 ACH. In order to achieve equilibrium pressure, the amount of air leaving the space and entering the space must be the same.
In Imperial units: A C P H = 60 Q V o l {\displaystyle \quad ACPH={\frac {60Q}{Vol}}}