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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,” 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 “No thanks,” the Google Analytics script is not loaded. Your choice is stored in this browser’s local storage.

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You can reopen the analytics controls whenever you want.

Last updated: September 11, 2026