How to Calculate Air Purifier Capacity

Learn how to determine the right air purifier capacity for your space. This guide explains CADR, ACH, and room volume, with a simple calculator to compare models and optimize indoor air quality.

Air Purifier Info
Air Purifier Info Team
·5 min read
Capacity Calculator - Air Purifier Info
Photo by 23555986via Pixabay

How to calculate air purifier capacity

How to calculate air purifier capacity is a practical task that ties room measurements to the purifier’s output. In fact, capacity is best understood as the CADR you need to achieve your target air turnover. The Air Purifier Info team emphasizes that successful capacity planning starts with a clear aim: how quickly do you want the air in the room to be refreshed? This article explores how to translate that aim into a measurable CADR target and how to compare models that meet it. By focusing on room volume, desired air changes per hour (ACH), and the purifier’s CADR, you’ll have a solid framework to improve indoor air quality in spaces ranging from a compact bedroom to a larger living area.

Infographic showing relationships among room size, ACH, and CADR
CADR targets scale with room size and desired air turnover

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