Privacy & analytics

The calculator runs in your browser. It does not send the room dimensions, CADR values, or custom air-change target you enter to our server or analytics service.

Optional Google Analytics

If you choose “Allow analytics,” this site loads Google Analytics 4 using measurement ID G-HNEYDX8JLL. It can record page visits and a limited event when you copy a result. That event may include the measurement system, selected target type, number-of-purifiers category, and whether you used the candidate checker. It never includes your numeric inputs or calculated result.

If you choose “Essential only” on a new visit, the Google Analytics script is not loaded. If you change from “Allow analytics” during the same page visit, consent is denied immediately and the page reloads to remove the already-loaded Google tag. Your choice is stored in this browser’s local storage.

Google AdSense

This site loads Google AdSense publisher code to support advertising. Google may receive ordinary request information when that code loads. We do not send room dimensions, CADR values, targets, or calculated results to AdSense. Advertising storage, ad user data, and ad personalization remain denied unless an appropriate regional consent flow updates that choice.

Change your choice

You can reopen the analytics controls whenever you want.

Last updated: September 13, 2026