calculation calculation 25. If it is recommended that a patient's hospital room have a minimum of 12 ACH and the room is 15 -25 - 12 ft, what quantity of air needs to be supplied to (and exhausted from the room? 26. The velocity of air in a duct is 3,582 ft per min. What is the velocity pressure? a 0.2 b. 0.8 c. 54.1 d. 1,800 --Concept 27 hatcleaning 1 calculation 28. What volumetric flow rate is needed to capture contaminant vapors in front of a 6- At-long slot-type hood in order to maintain a capture velocity of 150 ft per min 2 ft from the slot opening