Skip to main content

Fresh Air Calculator

Lifestyle Tools

Per-person 30 m³/h vs ACH method · purifier CADR reference

Quick Answer

Fresh Air Calculator: Per-person 30 m³/h vs ACH method · purifier CADR reference. Fresh Air Calculator uses standard everyday life formulas to compute accurate results instantly.

Fresh Air Calculator

m²
m
persons
Recommended airflow168m³/h
By area168
Per person90
Purifier CADR ref840

How it works

  1. 1By area: 60 × 2.8 × 1 = 168 m³/h
  2. 2Per person: 3 × 30 = 90 m³/h
  3. 3max(168, 90) = 168 m³/h
Per GB/T 18883, provide 30 m³/h fresh air per person. Size the unit at the larger of the two methods; duct friction may reduce delivered airflow by 10-20%. Purifier CADR reference: room area × height × 5 ACH. Estimate only - follow HVAC design for critical spaces.

Was this tool helpful?

How to Use

  1. Enter scenario values: fill real-life numbers into the Fresh Air Calculator (defaults work for a quick try).
  2. Instant results: everything computes live, no button needed.
  3. Read the advice: results come with practical tips, reference standards and pitfalls.
  4. Compare options: adjust parameters to compare choices side by side.

Key Points

  • Fresh Air Calculator is a free online everyday life tool — open and use, no sign-up.
  • All calculations run locally in your browser; your data never leaves the device.
  • Key capability: Per-person 30 m³/h vs ACH method · purifier CADR reference.
  • Results come with formulas and reference tables so you can verify every number.

Formula & How It Works

Fresh Air Calculator formula

Fresh Air Calculator uses standard everyday life formulas to compute accurate results instantly.

FAQ

How do I use the Fresh Air Calculator?
Open the page and fill in the input fields — results update automatically. Per-person 30 m³/h vs ACH method · purifier CADR reference.
Are the results accurate?
Yes. Standard formulas and conversion factors are used and verified.
Is it free? Do I need to sign up?
Completely free. No registration, login or download required.
Does it work on mobile?
Yes. The responsive design works on phones, tablets and desktops.
Is my data saved?
No. Everything runs locally in your browser.

Related Tools

Related Guides

Source & Updates

Based on common formulas and industry conventions. Last updated: 2025-07

Last updated:

Formulas and content on this page are reviewed by the YiJianSuan team. For reference only — official sources prevail.

Maintained and periodically reviewed by the YiJianSuan editorial team — review process in ourEditorial Policy.

Cite this page: YiJianSuan. Fresh Air Calculator[EB/OL]. https://www.yijiansuan.com/en/c/life/fresh-air

Results provided by this tool are for reference only and do not constitute professional advice.