Privacy policy
Last updated: October 19, 2026
What we collect
Calculators run entirely in your browser; the dimensions and airflow figures you enter are not sent to us. We use Vercel Web Analytics to count page views. It does not use cookies and does not identify individual visitors.
Affiliate links
When you follow an affiliate link to a retailer such as Amazon, that retailer may set cookies to attribute the purchase. Their handling of your data is governed by their own privacy policy.
If you email us, we use your address only to reply.