To achieve 5 ACH in a 200 m3 room, what is the required air supply rate in m3/h?

To achieve 5 ACH in a 200 m3 room, what is the required air supply rate in m3/h?

• A. 400
• B. 1000
• C. 600
• D. 1200

Answer: (B)

Air changes per hour (ACH) tells you how many times the room’s air volume is replaced in one hour. To meet 5 ACH in a room with a volume of 200 m3, you need a supply flow equal to 5 times the room volume: 5 × 200 = 1000 m3/h. So the required air supply rate is 1000 m3/h. For context, 400 m3/h would give 2 ACH, 600 m3/h would give 3 ACH, and 1200 m3/h would give 6 ACH, so 1000 m3/h best matches 5 ACH.

Air changes per hour (ACH) tells you how many times the room’s air volume is replaced in one hour. To meet 5 ACH in a room with a volume of 200 m3, you need a supply flow equal to 5 times the room volume: 5 × 200 = 1000 m3/h. So the required air supply rate is 1000 m3/h. For context, 400 m3/h would give 2 ACH, 600 m3/h would give 3 ACH, and 1200 m3/h would give 6 ACH, so 1000 m3/h best matches 5 ACH.