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----- Critically Important -----
Adobe has deemed that the Flash content on web pages is too risky to be used by the general internet user. For virtually all modern browsers, support for Flash was eliminated on 1-1-2021. This means that those browsers will not display any of the interactive Flash demos/calculators/graphics on this (or any other) site.
The simplest (not the best) fix, for now, is to download the Ruffle extension for your browser. It will render the Flash files where they were previously blocked. In some browsers, you will have to click on the big 'play' button to make the Flash applets/graphics visible.
An alternative to Ruffle for viewing Flash content is to use an alternative browser like the older, portable version of Chrome (chromium), an older version of Safari for Windows or one of several other browsers. More information on Flash capable browsers can be found HERE. It's not quite as simple as Ruffle but anyone even moderately familiar with the Windows Control Panel and installation of software can use Flash as it was intended.

In the diagram below, 'fuse A' would not need to be any larger than 1 amp (it MUST be rated to protect the wire feeding the switch from a short circuit). Fuse 'B' MUST be rated to protect the wire feeding the relay (in case of a short circuit). It should also be smaller than the current rating of the relay.

This shows how to wire a switch so that you can turn your fans (or any other device connected to the relay) off if you want. You can see that the switch is in series with the remote lead. For the relay to switch on, 2 things must happen. The remote lead must be high (no, not on drugs.. the head unit must be on) AND the switch must be switched to the on position (position B).

NOTE: The diode will prevent inductive kickback from the relay coil from damaging the switch contacts.

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