What is the recommended number of air changes per hour for effective allergy relief?
Answer
4.8 air changes per hour
Achieving roughly 4.8 air changes per hour (ACH) is the standard required to ensure an air purifier effectively cleans the air in a room, especially for individuals suffering from allergies. Many manufacturers deceptively advertise room coverage based on a rate of only one air change per hour, which is typically insufficient to keep airborne allergen levels low. Calculating the required Clean Air Delivery Rate (CADR) based on room volume and aiming for this higher ACH ensures that the air is circulated and cleaned frequently enough to make a noticeable difference in air quality.
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