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Air purifiers, with the arithmetic
Air purifiers, with the arithmetic: cADR turned into a room-size formula the reader can run, and air changes per hour costed in noise and electricity, so…
This launch guide maps the topic, the source base and the practical questions. Check the linked official authority before acting on a rule, deadline, price or safety requirement.
What this guide covers
CADR turned into a room-size formula the reader can run, and air changes per hour costed in noise and electricity, so "suitable for 60 m²" can be checked rather than believed. Item pages separate the real filter classes (EN 1822 / ISO 29463 E10-U17) from "HEPA-type", explain carbon saturation, set out what a purifier does for pollen, mite allergen, mould spores, fireplace and cooking PM2.5 and viruses — and what it does nothing for, starting with CO2.
Includes ozone-generating ionisers, filter cost per year, measured noise by speed, and a DIY box-fan filter with published CADR figures. ~15 pages.
How to use it
Use Air purifiers, with the arithmetic to understand the inputs, units and assumptions before relying on an output. A useful result should be reproducible from the named source rather than presented as an unexplained score.
The page keeps the main question, its evidence base and its limits together in one canonical place. That makes it useful as a quick orientation and avoids splitting a broad subject into shallow pages before each narrower answer has enough verified material of its own.
Search vocabulary in four languages
Terminology changes across borders. These are example phrases people use for the same subject in Estonian, Finnish, Russian and English; they are included as a practical vocabulary aid, not as hidden keywords.
| Language | Example phrase |
|---|---|
| Estonian | õhupuhasti allergikule kas aitab |
| Finnish | ilmanpuhdistin allergiaan |
| Russian | очиститель воздуха при аллергии помогает |
| English | what CADR do I need for my room |
Evidence and provenance
The evidence map below records the primary, official or openly licensed material chosen for this guide. It is deliberately visible so a reader can tell the difference between a rule published by an authority, a measured dataset and an editorial explanation.
Source: US EPA Guide to Air Cleaners in the Home (public domain), AHAM AC-1 CADR directory (public), EN 1822 / ISO 29463 class tables (catalogue abstracts), California ozone-generator list (public), published Corsi-Rosenthal CADR measurements (cited); sizing computed. · checked 2026-09-09
Source names are preserved even where an authority changes its web address. No figure is added to this launch page unless it is already present in the cited source description or can be computed from a named dataset.
Scope and boundaries
This guide owns the explanatory layer for the topic. Personal decisions, diagnoses, legal determinations and live availability remain with the relevant professional or official service.
Connected TempoLife guides
The following paths are the intentional hand-offs named in the brief. They keep adjacent subjects separate while making the next useful reference easy to find.
Why it belongs on TempoLife
/allergy, /europe-pollen-forecast-calendar, /baltic-air-quality-nowcast-atlas.
Frequently asked questions
What does this guide cover?
CADR turned into a room-size formula the reader can run, and air changes per hour costed in noise and electricity, so "suitable for 60 m²" can be checked rather than believed. Item pages separate the real filter classes (EN 1822 / ISO 29463 E10-U17) from "HEPA-type", explain carbon saturation, set out what a purifier does for pollen, mite allergen, mould spores, fireplace and cooking PM2.5 and viruses — and what it does nothing for, starting with CO2. Includes ozone-generating ionisers, filter cost per year…
What evidence does it use?
US EPA Guide to Air Cleaners in the Home (public domain), AHAM AC-1 CADR directory (public), EN 1822 / ISO 29463 class tables (catalogue abstracts), California ozone-generator list (public), published Corsi-Rosenthal CADR measurements (cited); sizing computed.
Where does this guide stop?
It explains the topic and points to primary or official sources. It does not replace a qualified professional, an official decision, or advice based on your own circumstances.
Turn the reference into a routine
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