The short version
- The builder runs entirely in your browser. Every calculation happens on your device.
- No cookies. No advertising, fingerprinting, or tracking across sites.
- The builder page counts page views using Cloudflare Web Analytics, which sets no cookies and builds no profile of you. The help, methodology, calculator, fan gauge, contact, and policy pages do not count anything at all.
- No account, no sign-up, and no email is required to use it.
- Your design is not saved on any server. It lives only in your browser and, if you choose, in a link you can share.
- Because the builder sets no cookies, there is no cookie banner to click through.
Your inputs and designs
The values you enter, such as room size and fan choice, are processed in your browser to produce the results. They are not transmitted to us and are not stored on our servers.
So that you can bookmark or share a configuration, the builder encodes your current settings into the page address (the URL). That link contains only design parameters, nothing personal, and it is built on your own device. If you send the link to someone, they can open the same design; that is the point of sharing it.
Close the tab or clear the page and nothing about your session remains on our side, because none was kept.
A few pages include third-party content
Apart from the page-view count described below, the core builder pulls in nothing from third parties.
- Page views on the builder. The builder page loads a small script from Cloudflare that counts visits, so we can see roughly how many people use the tool. It sets no cookies, stores nothing on your device, and does not follow you to other sites or build a profile. It records the page address, the site that referred you, and broad details such as country, browser, operating system, and device type, which Cloudflare reports back only as totals. No other page on this site loads it.
- Contact page. If you send us a message, the form is delivered by a service called FormSubmit. The details you type, meaning your email address, your message, and any file you attach, pass through FormSubmit so that your message reaches us and we can reply. FormSubmit shows a spam check (reCAPTCHA) when you submit. Please do not include sensitive information you would not put in an ordinary email.
- Air-changes calculator page. That page embeds a YouTube video in YouTube's privacy-enhanced (no-cookie) mode, and it loads only when you scroll down to it. YouTube (Google) sets no cookies unless you press play; if you do play it, Google receives that request under its own privacy policy. Nothing else in the builder uses YouTube.
- Reference and product links. Pages link out to sources and suppliers, for example Wikipedia, the CDC, GitHub, and Amazon. Following a link takes you to that third party, which has its own privacy policy.
GDPR and similar laws
The builder itself collects no personal data about you. Cloudflare receives your request, including your IP address, in order to serve the page and to work out which country a visit came from; it does not retain the address and we never see it. The resulting count is cookieless and aggregated and does not identify individuals, so there is essentially nothing for us to hold, correct, export, or erase about your use of the tool.
If you have emailed us or used the contact form, we keep that correspondence only for as long as we need it to help you, and you can ask us to delete it at any time. The lawful basis for handling a message you send us is your consent, together with our legitimate interest in replying to you.
To make a request, or to ask anything about this policy, please use the Contact page.